8-Letter Words Starting with O

All 277 eight-letter words that start with O

OB

• obduracy16n. The state of being obdurate, intractable, or stubbornly inflexible.
• obdurate11adj. Stubbornly persistent, generally in wrongdoing; refusing to reform or...
• obedient11adj. Willing to comply with the commands, orders, or instructions of those...
• obituary13n. A brief notice of a person's death, especially one published in a...
• objector19n. A person who objects to something.
• oblation10n. The offering of worship, thanks etc. to a deity.
• obligate11v. To bind, compel, constrain, or oblige by a social, legal, or moral tie.
• obliging12adj. Happy and ready to do favours for others.
• obliques19n. Collectively, the abdominal muscles responsible for rotation of the...
• obliquus19n. An obliquus muscle; a muscle running obliquely.
• oblivion13n. The state of forgetting completely, of being oblivious, unconscious...
• obscured13adj. Made hidden, less visible, or dark.
• observed14adj. Exceptionally celebrated on a date other than the usual date.
• observer13n. One who makes observations, monitors or takes notice.
• obsessed11adj. Intensely preoccupied with or by a given topic or emotion; driven by a...
• obsidian11n. A type of naturally occurring black glass produced by volcanoes.
• obsolete10adj. No longer in use or no longer useful; now disused or neglected (often...
• obstacle12n. Something that impedes, stands in the way of, or holds up progress...
• obstruct12v. To block or fill (a passage) with obstacles or an obstacle.
• obtunded12adj. Far from alert or oriented to time and space, and exhibiting other...
• obtusely13adv. In an obtuse manner.

OC

• occasion12n. A favorable opportunity; a convenient or timely chance.
• occident13n. The part of the horizon where the sun last appears in the evening; that...
• occluded14adj. Closed or obstructed.
• occluder13n. An object that partially or completely impedes the amount of light...
• occludin13n. Any of a family of plasma-membrane proteins located at tight junctions.
• occlusal12adj. On the side of a tooth which mates with the opposing tooth.
• occulted13adj. Hidden; secret.
• occultic14adj. Of or pertaining to the occult.
• occupant14n. A person who occupies an office or a position.
• occupied15adj. Reserved; engaged.
• occupier14n. One who occupies, particularly with respect to a foreign government...
• ocotillo10n. Any of various succulent plants, not closely related to the cactus, in...
• octoroon10n. Someone having one-eighth black ancestry.

OD

• oddments12n. A variety of miscellaneous things.
• odiously12adv. In an odious manner.
• odometer11n. An instrument, usually embedded within the speedometer of a vehicle...
• odometry14n. Measurement of distances by the odometer.
• odontoid10adj. Resembling a tooth, especially in shape.
• odorless9adj. Having no odor.

OE

• oenology12n. The scientific study of wines and winemaking.

OF

• offender15n. One who gives or causes offense, or does something wrong.
• offering15n. The act by which something is offered.
• official16adj. Of or about an office or public trust.
• officina16n. A monetary office that issues coins.
• offprint16n. A reproduction of a single article from a journal or similar...
• offshoot17n. Something which shoots off or separates from a main stem or branch of a...
• offshore17adj. Moving away from the shore.
• offsider15n. A partner, assistant, or deputy.
• offstage15adj. Of or relating to that part of a stage not visible to the audience.
• offworld18adj. Not on Earth.
• ofttimes13adv. (elsewhere, archaic) Often, frequently.

OH

• ohmmeter15n. A portable device for measuring relatively small values of electrical...

OI

• oilcloth13n. A fabric or cloth treated on one side with a waterproof covering...
• oiliness8n. The quality of being oily.
• oilskins12n. A waterproof garment, made from oilskin, used especially at sea.
• ointment10n. A viscous preparation of oils and/or fats, usually containing...
• oiticica12n. The tree Licania rigida, endemic to Brazil and Puerto Rico.

OL

• olaparib12n. A particular anticancer drug.
• oldstyle12n. A traditional style of typeface designed to mimic the handwriting of...
• oldtimer11n. An elderly person.
• oleander9n. Nerium oleander, a notoriously poisonous shrub in the dogbane family...
• oligarch14n. A member of an oligarchy; someone who is part of a small group that...
• oligomer11n. A compound intermediate between a monomer and a polymer, normally...
• oliguria9n. A decreased production in the volume of urine.
• oliphant13n. An ancient ivory hunting-horn.

OM

• omelette10n. A dish made with beaten eggs cooked in a frying pan without stirring...
• omission10n. The act of omitting.
• omitting11n. An act of omission.
• omnivore13n. An animal which is able to consume both plants (like a herbivore) and...
• omphalos15n. An ancient religious stone artifact, or baetylus, used to denote the...

ON

• oncidium13n. Any of the genus Oncidium of tropical orchidaceous plants.
• oncogene11n. Any gene that contributes to the conversion of a normal cell into a...
• oncology14n. The branch of medicine concerned with tumors, including study of their...
• oncoming13n. Approach, onset.
• onlooker12n. One who looks on or watches, without becoming involved or...
• onscreen10adj. As seen on a screen (as of television, film, or computer) rather than...
• onstream10adj. Being produced.
• ontogeny12n. Synonym of ontogenesis.
• ontology12n. The branch of metaphysics that addresses the nature or essential...

OO

• oomycete15n. Any of a number of filamentous unicellular protists of the class...

OP

• opaquely22adv. In an opaque manner.
• openable12adj. Capable of being opened.
• opencast12adj. Of or pertaining to strip mining, in which material is removed from a...
• openness10n. Accommodating attitude or opinion, as in receptivity to new ideas...
• openside11n. The space on the side of the pitch with the larger distance between the...
• openwork17n. Any of several forms of metalwork or needlework having decorative...
• operable12adj. Able to be operated or used.
• operably15adv. Such that it allows an operation to take place.
• operated11adj. Operated by the means specified e.g. a battery-operated toy.
• operatic12adj. Of, related to, or typical of opera.
• operator10n. A person or organisation that operates a device, system, service, etc.
• operetta10n. A lighter version of opera with a frivolous story and spoken dialogue.
• ophidian14n. Any species of the suborder Serpentes; a snake or serpent.
• opponent12n. One who opposes another; one who works or takes a position against...
• opposing13adj. That opposes or oppose; on the opposite side.
• opposite12adj. Located directly across from something else, or from each other.
• optation10n. A wish; a desire.
• optative13adj. Expressing a wish or a choice.
• opticals12n. Spectacles.
• optician12n. A person who makes, dispenses or sells lenses, spectacles.
• optimism14n. A tendency to expect the best, or at least, a favourable outcome.
• optimist12n. A person who expects a favourable outcome.
• optimize21v. To act optimistically or as an optimist.
• optional10adj. Not compulsory; left to personal choice; elective.
• optioned11adj. Having the specified kind or number of options.
• optronic12adj. Optoelectronic.
• opulence12n. Wealth.

OR

• oracular10adj. Of or relating to an oracle.
• orangery12n. A greenhouse in which orange trees are grown.
• orangish12adj. Relatively orange in colour.
• oratorio8n. A musical composition, often based on a religious theme; similar to...
• orbifold14n. A topological space in which every small enough neighborhood is...
• orchitis13n. A painful inflammation of one or both testes.
• ordained10adj. Established by authority.
• ordering10n. Arrangement in a sequence.
• ordinary12n. A person having immediate jurisdiction in a given case of...
• ordinate9n. The second of the two terms by which a point is referred to, in a...
• ordnance11n. Military equipment, especially weapons and ammunition.
• organise9v. Non-Oxford British standard spelling of organize.
• organism11n. A discrete and complete living thing, such as animal, plant, fungus or...
• organist9n. A musician who plays the organ.
• organize18v. To arrange in working order.
• organoid10adj. Resembling an organ of the body.
• orgastic11adj. Orgasmic (exciting or stimulating; relating to or prone to orgasm).
• oriented9adj. Having a specific orientation (positioning or direction).
• origanum11n. Any herbaceous plant of the genus Origanum.
• original9adj. Relating to the origin or beginning; preceding all others.
• orlistat8n. A drug designed to treat obesity.
• ornament10n. An element of decoration; that which embellishes or adorns.
• ornately11adv. In an ornate manner.
• orogenic11adj. Concerned with orogeny; pertaining to the creation of mountains.
• orphaned14adj. Made an orphan by the death of one's parents.
• orpiment12n. Arsenic trisulphide, occurring naturally in crystals or massive...
• orthodox19adj. Conforming to the accepted, established, or traditional doctrines of a...
• ortholog12n. Any of two or more homologous gene sequences found in different species...
• orthosis11n. A type of brace which either prevents or assists movement of a limb or...
• orthotic13adj. Of or pertaining to orthotics.

OS

• ossified12adj. Having undergone the process of ossification (transformation into bone...
• osteitis8n. Inflammation of bone.
• ostinato8n. A piece of melody, a chord progression, or a bass figure that is...
• ostracod11n. Any of many small crustaceans, of the class Ostracoda, that resemble a...
• ostracon10n. A piece of pottery or stone, usually broken off from a vase or other...

OT

• otherkin15n. One who believes their soul, essence, or identity is non-human.
• otoscope12n. An instrument used for examining the eardrum and interior of the outer...
• ototoxic17adj. Causing ototoxicity.
• ottavino11n. A miniature virginal, pitched one octave higher than the larger version.

OU

• outboard11adj. Situated outside the hull of a vessel.
• outbound11adj. Leaving or departing; traveling away from; outward bound.
• outbrain10v. To exceed in mental ability; to be cleverer than.
• outbreak14n. An eruption; the sudden appearance of a rash, disease, etc.
• outbreed11v. To breed from parents not closely related.
• outburst10n. An intense period of activity.
• outcaste10n. An outcast from the caste system.
• outclass10v. To surpass something or somebody else, so as to appear to be in a...
• outcross10n. The introduction of unrelated breeding stock to an existing population...
• outdated10adj. Out of date, old-fashioned, antiquated.
• outdoing10n. The act by which one person outdoes another.
• outdoors9adv. Not inside a house or under covered structure; unprotected; in the open...
• outdrink13v. To drink more than (someone else).
• outdrive12v. To drive a vehicle, etc. farther or better than.
• outfield12n. The region of the field between the infield and the outer fence.
• outfight15v. To fight or battle better than.
• outflank15v. To maneuver around and behind the flank of (an opposing force).
• outgoing10adj. Extroverted: talkative, friendly, and social, especially with respect...
• outgroup11n. The group of people who do not belong to one's own social group.
• outguess9v. To beat through accurate anticipation of someone's plans and actions.
• outhouse11n. An outbuilding, typically permanent, containing a toilet or seat over a...
• outlands9n. Any outlying area of a country; the provinces.
• outlawed12adj. Put beyond the limits of the law, forbidden, against the law.
• outlawry14n. A declaration that an individual cannot benefit from the protection of...
• outlined9adj. Containing an outline.
• outliner8n. One who or that which draws an outline.
• outlying12adj. Relatively remote from some central location.
• outmatch15v. To surpass or be better than something or someone else.
• outmoded12adj. Unfashionable.
• outpoint10v. To score more points than (especially, in boxing, to achieve victory by...
• outrance10n. The furthest degree or extremity, going beyond bounds or propriety.
• outreach13n. The act of reaching out.
• outremer10n. An area beyond the sea.
• outrider9n. A guide or escort, especially one who rides in advance.
• outright12adv. Wholly; completely; entirely.
• outscore10v. To score more than.
• outshine11v. To shine brighter than something else.
• outshoot11v. To score more goals than the other side in a goal sport such as hockey...
• outsider9n. Someone who is not part of a particular community, profession...
• outsized18adj. Of an unusually large size.
• outskirt12n. A more remote part of a town or city; the periphery, environs; a suburb.
• outsmart10v. To beat in a competition of wits.
• outspend11v. To spend more than some limit or than another entity.
• outspent10adj. Exhausted; tired out.
• outstand9v. To surpass in standing; stand or remain beyond; outstay.
• outstate8adj. Of the part of a state of the United States that is away from major...
• outstrip10v. To move more quickly than (someone or something) so as to outrun or...
• outthink15v. To best an opponent by thinking.
• outwards12adv. From the interior toward the exterior; in an outward direction.
• outweigh15v. To exceed in weight or mass.
• outworld12n. A planet that is remote from the homeworld of a civilization.

OV

• overaged13adj. Aged too much.
• overalls11n. A loose-fitting garment worn over regular clothes to protect them.
• overawed15adj. Impressed or convinced by someone to an unreasonable degree, sometimes...
• overbank17adj. Describing sediments deposited on a floodplain from suspensions in...
• overbear13v. To push through by physical weight or strength; to overwhelm, overcome.
• overberg14adj. Beyond a mountain.
• overbite13n. A malocclusion in which the upper teeth extend over the lower ones.
• overblow16v. To cover with blossoms or flowers.
• overbook17v. To sell or guarantee more seats for (an event) than actually exist.
• overcall13v. To call a bet after another player has already called.
• overcast13n. A cloud covering all of the sky from horizon to horizon.
• overcoat13n. A heavy garment worn over other clothes, for protection from cold or...
• overcome15v. To surmount (a physical or abstract obstacle); to prevail over, to get...
• overcook17v. To cook for too long or at too high a temperature.
• overdone12adj. Cooked too much.
• overdose12n. An excessive and dangerous dose of a drug.
• overdraw15v. To withdraw more money from an account than there is credit; to make an...
• overfeed15v. To feed a person or animal too much.
• overfill14v. To fill beyond capacity or beyond what is appropriate.
• overflow17n. The spillage resultant from overflowing.
• overfull14adj. Excessively filled; full to overflowing.
• overgrow15v. To grow beyond one's boundaries or containment, or beyond the proper...
• overhand15adj. Executed with the hand brought forward and down from above the...
• overhang15v. To hang over (something).
• overhaul14n. A major repair, renovation, or revision.
• overhead15adj. Located above, especially over the head.
• overhear14v. To hear something that was not meant for one's ears.
• overheat14v. To heat excessively.
• overhung15adj. Covered over; ornamented with hangings.
• overhype19v. To promote or publicize excessively.
• overkill15n. A destructive capacity that exceeds that needed to destroy an enemy...
• overland12adj. By or across land.
• overleaf14adv. On the other side of a sheet of paper (including a leaf of a book)...
• overline11n. Synonym of overbar.
• overload12v. To load excessively.
• overlock17n. A stitch that sews over the edge of one or two pieces of cloth for...
• overlong12adj. Too long; overly long.
• overlook15n. A vista or point that gives a view down toward something else.
• overlord12n. A ruler of other rulers.
• overmind14n. The leading or controlling mind in a groupmind.
• overmuch18det. Very much; too much; overly much.
• overpack19v. To pack too much.
• overpass13n. A section of a road or path that crosses over an obstacle, especially...
• overplay16v. To overdo or overact one's effect or role.
• overrate11v. To esteem too highly; to give greater praise than due.
• override12v. To ride across or beyond something.
• overripe13adj. Excessively ripe; spoiled; gone bad.
• overrule11v. To rule over; to govern or determine by superior authority.
• overscan13n. The additional area around the four edges of a video image, outside of...
• overseas11adj. Abroad, especially across the sea.
• overseer11n. The manager of a plantation of slaves.
• oversell11v. To agree to sell more of something than one can supply.
• overshot14adj. Powered by water that flows over the top from above (of a water wheel).
• overside12adj. Located or positioned over the side, especially of a ship.
• oversize20adj. Larger than normal.
• oversold12adj. In a stock or commodity market condition where there has been...
• oversoul11n. A supreme reality or mind; the spiritual unity of all being.
• overstay14v. To remain present after the agreed or appropriate departure time.
• overstep13v. To go too far beyond (a limit); especially, to cross boundaries or...
• overtake15v. To pass a slower moving object or entity (on the side closest to...
• overtime13n. Working time outside of one's regular hours.
• overtone11n. A tone whose frequency is an integer multiple of another; a member of...
• overture11n. An approach or proposal made to initiate communication, establish a...
• overturn11v. To turn over, capsize or upset.
• overused12adj. Used too much, or too often.
• overview17n. A brief summary, as of a book or a presentation.
• overwash17v. To wash too much or too often.
• overwork18v. To make (someone or something) work too hard.
• overwrap16n. A secondary wrapper covering an item.
• oviposit13v. To lay eggs.

OX

• oxazepam28n. A drug of the benzodiazepine group, used to treat anxiety states and...
• oxidized26adj. That has reacted with oxygen, or been modified by oxidation.
• oxidizer25n. An oxidizing agent, especially one used to oxidize the fuel of a rocket...
• oximeter17n. A device that measures the quantity of oxygen in something...
• oximetry20n. The measurement of the oxygen level in arterial blood.
• oxygenic21adj. Of, relating to, containing or producing oxygen.
• oxymoron20n. A figure of speech in which two words or phrases with opposing meanings...
• oxytocic22adj. Serving to promote uterine contractions, thus accelerating childbirth.
• oxytocin20n. A hormone that stimulates contractions during labor, and then the...

Questions about these words

How many eight-letter words that start with O are there?

Word.ws lists 277 eight-letter words that start with O, plus 1,244 rare ones.

What are common eight-letter words that start with O?

original, official, opposite, offering, ordinary, observed, occasion and operated.

Which of the eight-letter words that start with O has the highest letter score?

oxazepam scores 28 points with the standard letter tile values.

Related word lists

• 8-Letter Words
• Words That Start with O
• 7-Letter Words Starting with O
• 9-Letter Words Starting with O
• Q Words Without U