6-Letter Words Starting with O

All 171 six-letter words that start with O

OA

• oafish12adj. Characteristic of or resembling an oaf; clumsy, stupid.

OB

• obasan8n. A Japanese middle-aged woman.
• obelus8n. A symbol resembling a horizontal line (–), sometimes together with one...
• obiang9adj. Kitschy; tasteless; inauthentic.
• obiter8adv. Incidentally; in passing.
• object17n. A thing that has physical existence but is not alive.
• oblast8n. A region or province in Slavic or Slavic-influenced countries.
• oblate8n. A person dedicated to a life of religion or monasticism, especially a...
• oblige9v. To constrain someone by force or by social, moral or legal means.
• oblong9adj. Having a length and width that are different; not square or circular.
• oboist8n. Someone who plays an oboe.
• obsess8v. To be preoccupied with a single topic or emotion.
• obtain8v. To get hold of; to gain possession of, to procure; to acquire, in any...
• obtuse8adj. Blunt; not sharp, pointed, or acute in form.

OC

• occhio13n. A sound hole.
• occult10v. To cover or hide from view.
• occupy15v. To fill.
• ocelot8n. An American feline carnivore (Leopardus pardalis, syn. Felis pardalis)...
• ocracy13n. Any of various forms of government or rule as designated by words...
• octane8n. Any of the eighteen isomeric aliphatic hydrocarbons (C₈H₁₈) found in...
• octant8n. The eighth part of a circle; an arc of 45 degrees.
• octave11n. An interval of twelve semitones spanning eight degrees of the diatonic...
• octavo11n. A sheet of paper 7 to 10 inches (= 17.78 to 25.4 cm) high and 4.5 to 6...
• octree8n. A treelike data structure each of whose nodes has up to eight children...
• octroi8n. A privilege granted by the sovereign authority, such as the exclusive...
• ocular8adj. Of, or relating to the eye, or the sense of sight.
• oculus8n. The central boss of a volute.

OD

• oddish11adj. Somewhat odd.
• oddity11n. An odd or strange thing or opinion.
• odelay10interj. Expressing approval or encouragement.
• odious7adj. Arousing or meriting strong dislike, aversion, or intense displeasure.

OE

• oedema9n. Standard spelling of edema.
• oeuvre9n. A work of art, music or literature.

OF

• offend13v. To hurt the feelings of; to displease; to make angry; to insult.
• office14n. A ceremonial duty or service, particularly.
• offing13n. The area of the sea in which a ship can be seen in the distance from...
• offish15adj. Aloof, standoffish.
• offset12n. Anything that acts as counterbalance; a compensating equivalent.

OG

• ogdoad9n. A thing made up of eight parts.
• ogival10adj. Having the curved, pointed shape of an ogive.
• ogling8n. Action of the verb to ogle.
• ogress7n. A female ogre.

OI

• oidium9n. A fragile spore produced by some fungi.
• oiling7n. An application of oil.
• oilman8n. Somebody (especially a man) involved in the production, refinement or...

OL

• oldest7n. The oldest child in a family, or individual in a group.
• oldish10adj. Somewhat old.
• oleate6n. Any salt or ester of oleic acid.
• olefin9n. Any of a class of unsaturated open-chain hydrocarbons such as ethylene...
• oliver9n. A small tilt hammer, worked by the foot.
• olivet9n. An imitation pearl manufactured for trade with native peoples.

OM

• ombuds11n. Ombudsman (as an abbreviated or gender-neutral title, or in apposition...
• omened9adj. Acting as, or containing, an omen or omens.
• ometer8n. A measuring instrument.
• omnium10n. A multiple race event in track cycling. Historically the omnium has had...

ON

• onager7n. The Asiatic wild ass or hemione (Equus hemionus), an animal of the...
• onesie6n. A one-piece garment for an infant or small child, generally worn over a...
• oniony9adj. Resembling an onion or onions, especially in terms of smell.
• online6adj. Of a generator or power plant: connected to the grid.
• onload7v. To load onto or upon.
• onrush9n. A forceful rush or flow forward.
• onside7adj. Not in an offside position; in the part of the playing area where one...
• onsite6adj. On or at a site.
• ontake10v. To take on; undertake; assume.
• onward10adj. Moving forward.

OO

• oocyst11n. A thick-walled spore in the lifecycle of some parasitic protozoans that...
• oocyte11n. A cell that develops into an egg or ovum; a female gametocyte.
• oodles7n. Unspecified large amount, number, or quantity; lots, tons.
• oohing10n. An ooh sound.
• oolite6n. A rock consisting of spherical grains within a mineral cortex accreted...
• oolong7n. A partially fermented tea, often roasted, which combines the...
• oompah13v. To produce an oom-pah sound.
• oozing16n. Something that oozes; a seepage.

OP

• opaque17adj. Neither reflecting nor emitting light.
• opcode11n. A mnemonic used to refer to a microprocessor instruction in assembly...
• opened9adj. Having undergone opening.
• opener8n. A person who opens something.
• openly11adv. In an open manner; visibly.
• operon8n. A unit of genetic material that functions in a coordinated manner by...
• ophion11n. Any ichneumon wasp of the genus Ophion.
• ophrys14n. Any orchid of the genus Ophrys, often vernacularly called bee orchids.
• opiate8adj. Relating to, resembling, or containing opium.
• opilio8n. The snow crab Chionoecetes opilio.
• opioid9n. Any of the natural substances, such as an endorphin, released in the...
• oppose10v. To attempt to stop the progression of; to resist or antagonize by...
• optics10n. The physics of light and vision: basic optical science.
• optime10n. A student who graduates with second class ("senior optime") or third...
• option8n. One of a set of choices that can be made.

OR

• oracle8n. A shrine dedicated to some prophetic deity.
• orally9adv. By mouth.
• oranda7n. A goldfish characterized by a prominent raspberry-like hood encasing...
• orange7n. An evergreen tree of the genus Citrus such as Citrus sinensis which...
• orator6n. Someone who orates or delivers an oration.
• orchid12n. A plant of the orchid family (Orchidaceae), bearing unusually-shaped...
• orchis11n. An orchid; now specifically, a plant of the genus Orchis.
• orcish11adj. Of or relating to orcs (monstrous humanoid creatures).
• ordain7v. To prearrange unalterably.
• ordeal7n. A trial in which the accused was subjected to a dangerous test (such as...
• ordure7n. Dung, excrement.
• oremus8n. A liturgical prayer.
• orenda7n. A mystical power thought by the Iroquois to pervade all things.
• orexin13n. Either of two neuropeptide hormones found in vertebrates; the two are...
• orgeat7n. A sweet syrup made from sugar and almonds (or originally barley) and...
• orgone7n. In the psychoanalytic theory of Wilhelm Reich, a form of sexual energy...
• orient6n. The part of the horizon where the sun first appears in the morning; the...
• origin7n. The beginning of something.
• oriole6n. Any of various colourful passerine birds, New World orioles of the...
• orisha9n. A divine entity in Yoruba religion that possesses the supernatural...
• orison6n. A prayer.
• orkish13adj. Of, pertaining to, or sharing similarities with an orc.
• ormolu8n. Golden or gilded brass or bronze used for decorative purposes.
• ornate6adj. Elaborately ornamented, often to excess.
• ornery9adj. Disagreeable, stubborn, and troublesome to deal with; cantankerous.
• orogen7n. Rock deformed by orogeny; a belt of such rock(s).
• orotic8adj. Of or pertaining to orotic acid or its derivatives.
• orphan11n. A person, especially a minor, both or (rarely) one of whose parents...
• orrery9n. A clockwork model of any given solar system.

OS

• oscuro8n. A cigar made with very dark tobacco.
• osetra6n. Caviar made from the Russian sturgeon.
• oshana9n. A kind of seasonally inundated depression, particularly in Namibia's...
• osmium10n. A chemical element (symbol Os) with atomic number 76: a hard, brittle...
• osmose8v. To diffuse by osmosis.
• osprey11n. A bird of prey of genus Pandion that feeds on fish and has white...
• ossify12v. To transform (or cause to transform) from a softer animal substance...
• ostend7v. To exhibit or show.
• ostium8n. A small opening or orifice, as in a body organ or passage.
• ostler6n. A person employed at an inn, hostelry, or stable to look after horses...
• ostomy11n. A surgical procedure to provide an exit point for the waste of an...
• ostrog7n. A small Russian fort, typically wooden, encircled by a palisade wall.

OT

• others9n. Other people.
• otiose6adj. Having no effect.
• otitis6n. Inflammation of the ear.
• ottava9adv. One octave higher; as a marking, typically abbreviated 8va.
• ottery9adj. Of, pertaining to, or characteristic of an otter.

OU

• ouchie11n. Synonym of owie (“a painful but minor injury”).
• ourang7n. An orangutan.
• ouster6n. A putting out of possession; dispossession; ejection.
• outage7n. A temporary suspension of operation, especially of electrical power...
• outbid9v. To bid more than (somebody else) in an auction.
• outbox15n. A box holding papers to be transmitted to others, usually by mail.
• outcry11n. A loud cry or uproar.
• outfit9n. A set of clothing (with accessories).
• outfox16v. To beat (someone) in a competition of wits with superior cleverness or...
• outgas7v. To release (gaseous substances) into the air, especially of a polymer...
• outgun7v. To defeat in terms of firepower.
• outhit9v. To hit something better or further than (another), especially to score...
• outing7n. A pleasure trip or excursion.
• outlaw9n. A fugitive from the law.
• outlay9n. A laying out or expending; that which is laid out or expended.
• outlet6n. A vent or similar passage to allow the escape of something.
• outman8v. To have more people than (one's competitor); to outnumber in men.
• output8n. Production; quantity produced, created, or completed.
• outrun6v. To run faster than.
• outset6n. An onset; the beginning or initial stage of something.
• outtie6adj. Out, gone.
• outwit9v. To get the better of; to outsmart, to beat in a competition of wits.
• ouvert9n. A position in which the feet are apart, or a movement which brings them...

OV

• overby14adv. A little way over.
• overdo10v. To do too much; to exceed what is proper or true in doing; to carry too...
• overly12adv. To an excessive degree.
• ovular9adj. Of or pertaining to an ovule.

OW

• owings10n. That which is owed; debt.
• owlish12adj. Resembling or characteristic of an owl.
• ownage10n. Triumph or domination.

OX

• oxalic15adj. Of or pertaining to oxalic acid or its derivatives.
• oxalis13n. Any of various ornamental flowering plants of the genus Oxalis.
• oxcart15n. A cart designed to be drawn by an ox or oxen.
• oxtail13n. The tail of an ox or cow.
• oxygen17n. The chemical element (symbol O) with an atomic number of 8 and relative...

OY

• oyabun11n. The absolute leader of a yakuza clan. He has an advisor called a...
• oyster9n. Any of certain marine bivalve mollusks, especially those of the family...

Questions about these words

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

Word.ws lists 171 six-letter words that start with O, plus 418 rare ones.

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

others, office, online, opened, option, orange, object and origin.

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

oxygen scores 17 points with the standard letter tile values.

Related word lists

• 6-Letter Words
• Words That Start with O
• 6-Letter Words Ending in O
• 5-Letter Words Starting with O
• 7-Letter Words Starting with O
• Q Words Without U