Words Ending in UM

2-letter words ending in UM

• um4interj. Expression of hesitation, uncertainty or space filler in conversation.

3-letter words ending in UM

• bum7n. The buttocks.
• dum6adj. Cooked with steam.
• fum8v. To play upon a fiddle.
• gum6n. The flesh around the teeth.
• hum8n. A hummed tune, i.e. created orally with lips closed.
• lum5n. A chimney; also, the top part of a chimney.
• mum7n. Mother.
• num5interj. Used to denote eating, or enjoyment of eating.
• rum5n. A spirit distilled from various preparations of sugarcane, particularly...
• sum5n. A quantity obtained by addition or aggregation.
• tum5n. Shortened form of tummy.
• vum8v. To vow, swear.
• yum8interj. Indicating delight at the flavor of food.

4-letter words ending in UM

• alum6n. An astringent salt, usually occurring in the form of pale crystals...
• arum6n. A flower or plant in the genus Arum.
• chum11n. A friend; a pal.
• doum7n. The doum palm.
• drum7n. A percussive musical instrument spanned with a thin covering on at...
• enum6n. An enumeration.
• frum9adj. Pious, observant; committed to obeying all the laws of Judaism.
• geum7n. Any of the genus Geum of perennial herbaceous plants.
• glum7adj. Despondent; moody; sullen.
• grum7adj. Morose, stern, surly, sullen.
• jhum16n. A tribal form of cultivation in India, where a chosen piece of land is...
• khum13n. A commune of Cambodia, a subdivision of a srok.
• maum8n. An elderly woman (often as a title of respect).
• meum8n. Spignel, Meum athamanticum.
• odum7n. Synonym of mvule ("a tree of species Milicia excelsa").
• ovum9n. The female gamete in animals; the egg cell.
• phum11n. A village of Cambodia, a subdivision of a khum.
• plum8n. An edible, fleshy stone fruit of species Prunus domestica (European...
• saum6n. Fasting; one of the five pillars of Islam.
• scum8n. A layer of impurities that accumulates at the surface of a liquid...
• slum6n. Inexpensive trinkets awarded as prizes in a carnival game.
• stum6n. Unfermented grape juice; must.
• toum6n. A garlic condiment common in the Levant, similar to aioli, made with...

5-letter words ending in UM

• album9n. In Ancient Rome, a white tablet or register on which the praetor's...
• annum7n. A one-year period, particularly (finance) a fiscal year or (sciences) a...
• aurum7n. Gold (used in the names of various substances, see "Derived terms").
• begum10v. To daub or cover with gum.
• cavum12n. The lower part of the concha of the ear adjoining the origin of the...
• datum8n. Something known or assumed as fact, and is made the basis of reasoning...
• filum10n. A filamentous anatomical structure.
• forum10n. A place for discussion.
• garum8n. A fermented fish sauce popular as a condiment in Ancient Rome.
• hilum10n. The eye of a bean or other seed, or the center of that eye; the mark or...
• hokum14n. (An instance of) meaningless nonsense with an outward appearance of...
• ileum7n. The last, and usually the longest, division of the small intestine; the...
• ilium7n. The upper and widest of the three bones that make up each side of the...
• kokum15n. A plant (Garcinia indica) in the mangosteen family with culinary...
• kusum11n. A tree of species Schleichera oleosa, from whose seeds a multipurpose...
• kutum11n. A freshwater fish (Rutilus kutum) native to the Caspian Sea.
• ledum8n. Any plant of the genus Ledum.
• locum9n. A period working as a locum tenens.
• malum9n. An evil or wrongdoing.
• minum9n. A minim.
• notum7n. The back; the dorsal side of the thorax in insects or nudibranches.
• novum10n. A new feature, a novelty.
• oakum11n. Coarse fibres separated by hackling from flax or hemp when preparing...
• odium8n. Hatred; dislike.
• oleum7n. A solution of sulfur trioxide in sulfuric acid.
• onium7n. Any cation derived by the addition of a proton to the hydride of any...
• opium9n. A yellow-brown, addictive narcotic drug obtained from the dried juice...
• pilum9n. A Roman military javelin.
• resum7v. To perform resummation upon.
• rheum10n. Thin or watery discharge of mucus or serum, especially from the eyes or...
• scrum9n. A tightly packed and disorderly crowd of people.
• sebum9n. A thick oily substance, secreted by the sebaceous glands of the skin...
• sedum8n. Any of various succulent plants, of the genus Sedum, native to...
• serum7n. Blood serum used as a blood product, in the practice of medicine: blood...
• shtum10adj. Silent; speechless; dumb.
• solum7n. Within a soil profile, a set of related soil horizons that share the...
• strum7v. To play (a guitar or other stringed instrument) by plucking various...
• tatum7n. The shortest statistically significant time interval between successive...
• thrum10n. A thrumming sound; a hum or vibration.
• velum10n. The soft palate.

6-letter words ending in UM

• allium8n. Any of many bulbous plants of the genus Allium, including onions and...
• asylum11n. A place of safety or refuge.
• atrium8n. A central room or space in ancient Roman homes, open to the sky in the...
• barium10n. The chemical element (symbol Ba) with an atomic number of 56. It is a...
• caecum12n. A cavity open at one end (such as the blind end of a duct), especially...
• centum10adj. Referring to an Indo-European language that did not produce sibilants...
• cerium10n. A chemical element (symbol Ce) with an atomic number of 58, a very...
• collum10n. A neck, cervix, or neckline part or process.
• dictum11n. An authoritative statement; a dogmatic saying; a maxim, an apothegm.
• dinkum13adj. Genuine, true, honest, on the level.
• dorsum9n. The back of the tongue, used for articulating dorsal consonants.
• dumdum12n. A soft-nosed or hollow point bullet, or a lead bullet incised on the...
• erbium10n. A chemical element (symbol Er) with atomic number 68: a silvery-white...
• ferrum11n. Any of various remedies made from iron-containing compounds.
• gypsum14n. A mineral consisting of hydrated calcium sulphate. When calcinated, it...
• helium11n. The second-lightest chemical element (symbol He), with an atomic number...
• indium9n. A chemical element (symbol In) with an atomic number of 49: a soft...
• kumkum18n. A red powder, made from saffron or turmeric, used ceremonially by Hindu...
• labrum10n. The uppermost of the mouthparts (trophi) of a typical insect, such as a...
• luteum8n. Corpus luteum.
• lyceum13n. A public hall designed for lectures, readings, or concerts.
• magnum11n. A bottle containing 1.5 liters of fluid, double the volume of a...
• medium11n. The material of the surrounding environment, e.g. solid, liquid, gas...
• museum10n. A building or institution dedicated to the acquisition, conservation...
• omnium10n. A multiple race event in track cycling. Historically the omnium has had...
• osmium10n. A chemical element (symbol Os) with atomic number 76: a hard, brittle...
• parfum13n. Fragrance; perfume.
• peplum12n. A peplos, an Ancient Greek garment formed of a tubular piece of cloth...
• phylum16n. A rank in the classification of organisms, below kingdom and above...
• plenum10n. A space that is completely filled with matter.
• podium11n. A platform on which to stand, as when conducting an orchestra or...
• possum10n. A marsupial of several families of the order Diprotodontia, found in...
• quorum17n. A select body of (usually eminent) justices of the peace, every member...
• radium9n. The chemical element (symbol Ra) with an atomic number of 88. It is a...
• rectum10n. The terminal part of the large intestine through which feces pass after...
• redrum9v. To place into new drums (barrels).
• regnum9n. A rank in the classification of organisms, below dominium and above...
• sacrum10n. A large triangular bone at the base of the spine, located between the...
• septum10n. Either of the two walls that separate the atria or ventricles of the...
• signum9n. A sign, mark, or symbol.
• sodium9n. The chemical element (symbol Na) with an atomic number of 11 and atomic...
• sputum10n. Matter coughed up and expectorated from the mouth, composed of saliva...
• talcum10n. Powdered and perfumed talc for toilet use.
• targum9n. An Aramaic translation of the Tanakh written or compiled between the...
• tedium9n. Boredom or tediousness; ennui.
• vacuum13n. A region of space that contains no matter.
• vellum11n. A type of parchment paper made from the skin of a lamb, baby goat, or...
• wampum15n. Small cylindrical beads made from polished shells (especially white...

The 48 most common of 85 are shown.

7-letter words ending in UM

• arcanum11n. A mystery or deep secret.
• cadmium14n. A chemical element (symbol Cd) with an atomic number of 48: a soft...
• caesium11n. The chemical element (symbol Cs) with an atomic number of 55. It is a...
• calcium13n. The chemical element (symbol Ca) with atomic number 20: a soft...
• cambium15n. A layer of cells between the xylem and the phloem that is responsible...
• centrum11n. A centre.
• chillum14n. A conical pipe used for smoking marijuana, usually made of fired clay...
• corneum11n. The outermost layer of the skin.
• cranium11n. That part of the skull consisting of the bones enclosing the brain, but...
• decorum12n. Appropriate social behavior.
• eardrum10n. A thin membrane that separates the outer ear from the middle ear and...
• erratum9n. A published notice reporting an error belatedly discovered in a...
• fulcrum14n. The support about which a lever pivots.
• gallium10n. A chemical element (symbol Ga) with an atomic number of 31; a soft...
• hafnium15n. A chemical element (symbol Hf) with an atomic number of 72: a lustrous...
• hoodlum13n. A gangster; a hired thug.
• humdrum15adj. Lacking variety or excitement; dull; boring.
• iridium10n. (uncountable) A chemical element with an atomic number of 77: a very...
• ischium14n. The lowest of the three bones that make up each side of the pelvis.
• jejunum23n. The central of the three divisions of the small intestine which lies...
• lithium12n. The simplest alkali metal, the lightest solid element, and the third...
• maximum20n. The highest limit.
• minimum13n. The lowest limit.
• modicum14n. A modest, small, or trifling amount.
• niobium11n. A chemical element (symbol Nb) with an atomic number of 41: a light...
• nostrum9n. A medicine or remedy in conventional use which has not been proven to...
• opossum11n. Any American marsupial of the family Didelphidae in the order...
• optimum13n. The best or most favorable condition, or the greatest amount or degree...
• organum10n. A type of medieval polyphony which builds upon an existing plainsong.
• pallium11n. A large cloak worn by Greek philosophers and teachers.
• panicum13n. Any of the genus Panicum of tropical grasses.
• premium13adj. Superior in quality; higher in price or value.
• quantum18n. The total amount of something; quantity.
• rhenium12n. A metallic chemical element with the atomic number 75: a heavy...
• rhodium13n. A rare, hard, silvery-white, inert metallic chemical element (symbol...
• rostrum9n. A dais, pulpit, or similar platform for a speaker, conductor, or other...
• sanctum11n. A place set apart, as with a sanctum sanctorum; a sacred or private...
• solanum9n. Any plant in the genus Solanum.
• sorghum13n. A cereal, Sorghum genus and species, the grains of which are cultivated...
• stadium10n. A venue where sporting events are held.
• sternum9n. The breastbone, consisting of the manubrium, gladiolus, and xiphoid...
• stratum9n. One of several parallel horizontal layers of material arranged one on...
• tantrum9n. An often childish display or fit of bad temper.
• thorium12n. A chemical element (symbol Th) with atomic number 90. A weakly...
• tritium9n. A radioactive isotope of the element hydrogen (symbol T, ³H or 31H)...
• trivium12n. The lower division of the liberal arts in a medieval university...
• uranium9n. The element with atomic number 92 and symbol U. A radioactive...
• yttrium12n. A silvery metallic chemical element with an atomic number of 39, mainly...

The 48 most common of 84 are shown.

8-letter words ending in UM

• absurdum13n. An illogical conclusion or state.
• addendum13n. Something to be added; especially text added as an appendix or...
• alluvium13n. Soil, clay, silt or gravel deposited by flowing water, as it slows, in...
• aluminum12n. American, Canadian, and Philippines standard spelling of aluminium.
• ammonium14n. The univalent NH₄⁺ cation, derived by the protonation of ammonia.
• aquarium19n. A tank, often made of glass, for keeping live fish or other aquatic...
• callosum12n. Corpus callosum.
• capsicum16n. Any of various tropical American plants, of the genus Capsicum...
• cerebrum14n. The principal and most anterior part of the brain in vertebrates, which...
• checksum21n. A number, derived by applying a suitable algorithm to some data, used...
• chromium17n. A chemical element (symbol Cr) with an atomic number of 24: a...
• coliseum12n. A large theatre, cinema, or stadium.
• delirium11n. A temporary mental state with a sudden onset, usually reversible...
• disodium12n. Two atoms of sodium in a compound.
• duodenum12n. The first part of the small intestine, starting at the lower end of the...
• electrum12n. An alloy of gold and silver, used by the ancients; now specifically a...
• emporium14n. A city or region which is a major trading centre; also, a place within...
• europium12n. A metallic chemical element (symbol Eu) with an atomic number of 63.
• freemium15adj. Offering basic services for free while charging a premium for advanced...
• fusarium13n. Any of various fungi, of the genus Fusarium, some of which are...
• geranium11n. Any flowering plant of the genus Geranium, of family Geraniaceae.
• imperium14n. Supreme power; dominion.
• inoculum12n. The active material used in an inoculation; an inoculant (i.e., a...
• laudanum11n. Any of several tinctures of opium, once widely used for various medical...
• linoleum10n. An inexpensive waterproof covering used especially for floors, made...
• momentum14n. Of a body in motion: the tendency of a body to maintain its inertial...
• mycelium17n. The vegetative part of any fungus, consisting of a mass of branching...
• pendulum13n. A body suspended from a fixed support so that it swings freely back and...
• perineum12n. The region between the genitalia and anus.
• platinum12n. The chemical element with atomic number 78 and symbol Pt; a dense...
• polonium12n. A rare, highly radioactive chemical element (symbol Po) with atomic...
• pronotum12n. The dorsal plate of the prothorax in insects.
• rubidium13n. The chemical element (symbol Rb) with an atomic number of 37. It is a...
• santorum10n. A frothy mixture of lubricant and fecal matter as an occasional...
• secundum13prep. According to.
• selenium10n. A nonmetallic chemical element (symbol Se) with an atomic number of 34...
• solarium10n. A room, rooftop, balcony, or terrace, used for its abundant sunlight...
• spectrum14n. A range; a continuous, infinite, one-dimensional set, possibly bounded...
• speculum14n. A medical instrument used during an examination to dilate an orifice.
• sphagnum16n. Any of various widely distributed mosses, of genus Sphagnum, which...
• striatum10n. The caudate nucleus and the lentiform nucleus considered as a single...
• tantalum10n. A chemical element (symbol Ta) with atomic number 73: a rare, hard...
• thallium13n. A metallic chemical element (symbol Tl) with atomic number 81: a gray...
• titanium10n. A chemical element (symbol Ti), atomic number 22; it is a strong...
• trillium10n. Any of several perennial flowering plants, of the genus Trillium...
• tympanum17n. The eardrum (tympanic membrane, membrana tympanica).
• vanadium14n. A chemical element (symbol V) with atomic number 23; it is a transition...
• viburnum15n. Any of many shrubs and trees, of the genus Viburnum, native to the...

The 48 most common of 124 are shown.

9-letter words ending in UM

• aluminium13n. A light, silvery metal extracted from bauxite, and a chemical element...
• americium15n. The chemical element (symbol Am) with an atomic number of 95.
• antiserum11n. A serum prepared from human or animal sources containing antibodies...
• arboretum13n. A place where many varieties of tree are grown for research...
• athenaeum14n. An association or institution for the advancement of learning...
• bacterium15n. A single-celled organism with cell walls but no nucleus or organelles.
• beryllium16n. The chemical element (symbol Be) with an atomic number of 4; a soft...
• botulinum13n. An anaerobic soil bacterium, Clostridium botulinum, that secretes the...
• bubblegum18n. A sweet, stretchable chewing gum designed for blowing bubbles.
• collegium14n. A committee or council.
• colostrum13n. A form of milk produced by the mammary glands in late pregnancy and the...
• continuum13n. A continuous series or whole, no part of which is noticeably different...
• conundrum14n. A difficult question or riddle, especially one using a play on words in...
• criterium13n. A mass-start road-cycle race consisting of several laps around a closed...
• deuterium12n. An isotope of hydrogen with one proton and one neutron in each atom -...
• dilithium15n. The diatomic molecule Li₂ found in the gas phase.
• euphonium16n. A valved brass instrument with conical tubing similar in appearance to...
• flagellum15n. In protists, a long, whiplike membrane-enclosed organelle used for...
• germanium14n. A nonmetallic chemical element (symbol Ge) with an atomic number of 32...
• gymnasium17n. A large room or building for indoor sports.
• harmonium16n. A small keyboard instrument that consists of a series of reed pipes...
• herbarium16n. A collection of dried plants or parts of plants.
• hypericum21n. Any of many flowering plants of the genus Hypericum, St. John's worts.
• lanthanum14n. A chemical element (symbol La) with an atomic number of 57: a soft...
• magnesium14n. The chemical element with an atomic number of 12. It is a light, easily...
• mausoleum13n. A large stately tomb or a building housing such a tomb or several tombs.
• mysterium16n. Any of various unknown elements thought to make up existing forms of...
• neodymium17n. A chemical element (symbol Nd) with an atomic number of 60: a hard...
• operculum15n. A covering flap in animals and insects, such as a gill cover or the lid...
• palladium14n. A safeguard.
• petroleum13n. A flammable liquid ranging in color from clear to very dark brown and...
• plutonium13n. The transuranic chemical element with atomic number 94 and symbol Pu: a...
• polygonum17n. Any of many plants, of the family Polygonaceae, embracing a large...
• potassium13n. A soft, waxy, silvery reactive metal that is never found unbound in...
• practicum17n. A college course designed to give a student supervised practical...
• presidium14n. A permanent executive committee, used primarily in Communist countries...
• reticulum13n. A network. For example, the endoplasmic reticulum forms a network of...
• ruthenium14n. A metallic chemical element (symbol Ru) with an atomic number of 44.
• sargassum12n. Any of many brown algae of the genus Sargassum; gulfweed.
• strontium11n. The metallic chemical element (symbol Sr) with an atomic number of 38....
• symposium18n. A conference or other meeting for discussion of a topic, especially one...
• tellurium11n. The chemical element with atomic number 52. Symbol: Te. A rare...
• terrarium11n. An enclosure wherein small animals are displayed, usually with some...
• trapezium22n. A quadrilateral with two sides parallel.
• trifolium14n. Any of the genus Trifolium of clovers and trefoils.
• ultimatum13n. A final statement of terms or conditions made by one party to another...
• vaccinium18n. Any of the genus Vaccinium of ericaceous shrubs including the various...
• zirconium22n. A chemical element (symbol Zr) with an atomic number of 40, a strong...

The 48 most common of 114 are shown.

10-letter words ending in UM

• acetabulum16n. The bony cup of the hip bone which receives the head of the femur.
• adamantium15n. A fictional metal which is indestructible or nearly so.
• antebellum14adj. Of the time period prior to a war.
• argumentum15n. An argument or appeal, especially as used in various Latin phrases.
• auditorium13n. A large room for public meetings or performances.
• cerebellum16n. Part of the hindbrain in vertebrates. In humans it lies between the...
• colloquium23n. A colloquy; a meeting for discussion.
• compendium19n. A short, complete summary; an abstract.
• consortium14n. An association or combination of businesses, financial institutions, or...
• curriculum16n. The set of courses, coursework, and content offered at a school or...
• delphinium18n. A cultivated plant, belonging to the genus Delphinium, with tall...
• dendrobium16n. Any plant of the genus Dendrobium.
• dysprosium18n. A metallic chemical element (symbol Dy) with atomic number 66: a rare...
• epithelium17n. A membranous tissue composed of one or more layers of cells which forms...
• eupatorium14n. Any of the genus Eupatorium of perennial herbs.
• falciparum19n. The parasitic protozoan Plasmodium falciparum that causes falciparum...
• gadolinium14n. A chemical element (symbol Gd) with atomic number 64: a ductile...
• honorarium15n. Compensation for services that do not have a predetermined value.
• lebensraum14n. Hitherto unoccupied “living space” claimed as one’s rightful domain.
• lycopodium20n. A club moss of the genus Lycopodium.
• meerschaum19n. A soft white mineral, chiefly used for smoking-pipes and cigar holders.
• memorandum17n. A short note serving as a reminder.
• millennium14n. A period of time consisting of one thousand years.
• molybdenum20n. A chemical element (symbol Mo) with an atomic number of 42: a silvery...
• monosodium15n. One atom of sodium in a compound.
• moratorium14n. An authorization to a debtor, permitting temporary suspension of...
• myocardium20n. The muscular substance of the heart; the middle of the three layers...
• myometrium19n. The smooth muscle forming the wall of the uterus.
• nasturtium12n. The popular name of any of the plants in the Tropaeolum genus of...
• natatorium12n. A swimming pool, especially an indoor one; a building housing one or...
• opprobrium18n. Disgrace or bad reputation arising from exceedingly shameful behaviour...
• parabellum16n. A type of cartridge used in some handguns.
• paramecium18n. An oval-shaped protozoan organism of the genus Paramecium.
• periosteum14n. A membrane surrounding a bone.
• peritoneum14n. In mammals, the serous membrane lining the cavity of the abdomen and...
• petrolatum14n. Petroleum jelly.
• plasmodium17n. A mass of cytoplasm, containing many nuclei, created by the aggregation...
• postpartum16adj. After giving birth (often defined as within 30 days after childbirth).
• promethium19n. A metallic chemical element (symbol Pm) with an atomic number of 61.
• proscenium16n. The stage area between the curtain and the orchestra.
• referendum16n. A direct popular vote on a proposed law or constitutional amendment.
• sanatorium12n. An institution that treats chronic diseases, and provides supervised...
• simulacrum16n. A physical image or representation of a deity, person, or thing.
• sporangium15n. A case, capsule, or container in which spores are produced by an...
• substratum14n. A layer that lies underneath another.
• technetium17n. A metallic chemical element (symbol Tc) with an atomic number of 43.
• tricalcium16n. Three atoms of calcium in a chemical compound.
• vecuronium17n. A particular muscle relaxant drug.

The 48 most common of 92 are shown.

11-letter words ending in UM

• antirrhinum16n. Any plant of the genus Antirrhinum of snapdragons.
• californium18n. A strongly radioactive and highly fissile transuranic chemical element...
• candelabrum18n. A candle holder with branches to hold more than one candle.
• carborundum18n. Crystals of silicon carbide used as an abrasive.
• chenopodium21n. Any member of the flowering plant genus Chenopodium.
• clostridium16n. Any of several mostly anaerobic gram-positive bacteria, of the genus...
• columbarium19n. A columbary, especially a large and architecturally impressive one for...
• condominium18n. Joint sovereignty over a territory by two or more countries.
• corrigendum17n. An error that is to be corrected in a printed work after publication.
• crematorium17n. A place where the bodies of dead people are cremated.
• cypripedium23n. A member of the orchid genus Cypripedium.
• desideratum15n. Something that is wished for, or considered desirable, particularly...
• dipotassium16n. Two atoms of potassium in a compound.
• einsteinium13n. A transuranic chemical element (symbol Es) with atomic number 99: a...
• endocardium17n. A thin serous membrane that lines the interior of the heart.
• endometrium16n. The mucous membrane that lines the uterus in mammals and in which...
• endothelium17n. A thin layer of flat epithelial cells that lines the heart, serous...
• equilibrium24n. The condition of a system in which competing influences are balanced...
• florilegium17n. A collection of flowers.
• haematobium20n. A flatworm of the species Schistosoma haematobium, the urinary blood...
• helichrysum24n. Any of the genus Helichrysum of plants related to the sunflower.
• imaginarium16n. A place devoted to stimulating and cultivating the imagination.
• intermedium16n. An intermediary.
• interregnum14n. A period of time between the end of one monarch's reign and the...
• intrapartum15adj. During parturition (childbirth; labor).
• ipratropium17n. An anticholinergic drug C₂₀H₃₀NO₃⁺ that is used as an inhalational...
• itinerarium13n. An Ancient Roman road map in the form of a listing of cities, villages...
• legendarium15n. A literary collection of legends, particularly those detailing the life...
• leprosarium15n. An isolated building or community used to house lepers, usually in...
• magisterium16n. The teaching authority or office of the Roman Catholic Church.
• mediastinum16n. The region in mammals between the pleural sacs, containing the heart...
• megatherium19n. A ground sloth of the extinct genus Megatherium, esp. the megathere.
• ministerium15n. An association of ministers from various religious groups who come...
• pancuronium17n. A synthetic steroid which is used as a neuromuscular blocking agent.
• pandemonium18n. A loud, wild, tumultuous protest, disorder, or chaotic situation...
• pelargonium16n. Any of various flowering plants of the genus Pelargonium, similar to...
• penicillium17n. Any of the blue-green fungi, of the genus Penicillium, that are used in...
• pericardium18n. A serous membrane that surrounds the heart allowing it to contract.
• phosphonium23n. The tetravalent positively-charged phosphorus cation R₄P⁺.
• pittosporum17n. A plant of the genus Pittosporum, comprising various Old World shrubs...
• planetarium15n. A display museum in which images of stars and other astronomical...
• positronium15n. An exotic atom (specifically, an onium) consisting of a positron...
• retinaculum15n. A connecting band.
• sacramentum17n. An Ancient Roman oath or vow that rendered the swearer "given to the...
• scriptorium17n. A room set aside for the copying, writing, or illuminating of...
• sempervivum23n. Any of the genus Sempervivum of succulent plants, the houseleeks or...
• tetrazolium22n. A univalent cation derived from a tetrazole.
• unobtainium15n. A fictional material or component which, if it existed, would enable...

The 48 most common of 62 are shown.

12-letter words ending in UM

• benzalkonium29n. Any of a class of quaternary ammonium cations containing a benzyl, two...
• butyllithium22n. Any of three isomeric organolithium reagents used in chemical synthesis.
• diverticulum20n. A small out-pouching of an organ wall such as the large intestine or...
• dolphinarium20n. An aquarium that houses dolphins.
• epithalamium21n. A song or poem celebrating a marriage.
• infundibulum20n. A funnel-shaped cavity or organ.
• interstitium14n. An interstitial space within a tissue or organ.
• leptospermum20n. A tea tree of the genus Leptospermum.
• neurocranium16n. The part of the skull that encloses the brain.
• periodontium17n. The specialized tissues that both surround and support the teeth...
• periostracum18n. The proteinaceous outer sheath of many molluscan shells.
• praseodymium22n. A chemical element (symbol Pr) with an atomic number of 59, a soft...
• protactinium18n. A chemical element (symbol Pa) with atomic number 91. A dense...
• transuranium14adj. Transuranic.
• verticillium19n. Any of many fungi, of the genus Verticillium, that cause wilt in plants.

13-letter words ending in UM

• agrobacterium20n. A soil bacterium, of the genus Agrobacterium, which can fix nitrogen...
• armamentarium19n. All of the equipment available for carrying out a task, especially all...
• chrysanthemum28n. Any of many flowering perennial plants, of the genus Chrysanthemum...
• chrysosporium25n. Any fungus of the genus Chrysosporium.
• exploratorium24n. A museum or similar institution that encourages visitors to explore the...
• fusobacterium22n. Any bacterium of the genus Fusobacterium.
• halobacterium22n. Any of various extremophiles, of genus Halobacterium, found in water...
• multiplatinum19adj. Having exceeded the platinum level of sales on multiple occasions.
• mycobacterium26n. Any of many rod-shaped, aerobic bacteria, of the genus Mycobacterium...
• odontoglossum17n. Any of very many orchids of the genus Odontoglossum.
• organolithium19adj. Describing any organic compound containing a carbon to lithium bond.
• paphiopedilum25n. Any plant of the genus Paphiopedilum.
• suxamethonium27n. Synonym of suxamethonium chloride.

14-letter words ending in UM

• bradyrhizobium36n. Any bacterium of the genus Bradyrhizobium.
• conservatorium21n. Synonym of music school.
• cyanobacterium25n. Any of very many photosynthetic prokaryotic microorganisms, of phylum...
• disequilibrium28n. The loss of equilibrium or stability, especially due to an imbalance of...
• flavobacterium26n. Any of many Gram-negative rod-shaped bacteria, of the class...
• hemoperitoneum23n. The presence of blood in the peritoneal cavity.
• nonequilibrium27n. The condition of not being in equilibrium.
• supercontinuum20n. Light having both high spatial coherence and broad spectral bandwidth...

15-letter words ending in UM

• bifidobacterium27n. Any bacterium of the genus Bifidobacterium.
• corynebacterium26n. Any bacterium, of the genus Corynebacterium, many of which are...
• cryptosporidium27n. Any protozoan of the genus Cryptosporidium, intestinal parasites of...
• retroperitoneum19n. The space in the abdominal cavity behind the peritoneum.

Questions about these words

How many words ending in UM are there?

Word.ws lists 678 words ending in UM, plus 2,634 rare ones.

What are common words ending in UM?

album, museum, minimum, stadium, medium, maximum, mum and forum.

Which of the words ending in UM has the highest letter score?

bradyrhizobium scores 36 points with the standard letter tile values.

Related word lists

• Words Ending in M
• Words That Start with UM
• 5-Letter Words Ending in UM
• Q Words Without U