7-Letter Words Starting with O

All 249 seven-letter words that start with O

OA

• oakleaf14n. The leaf of the oak.
• oakmoss13n. Evernia prunastri, a lichen found primarily on oak trees and used in...
• oakwood15n. A wood populated with oak trees.
• oarfish13n. A large, greatly elongated, type of fish of the family Regalecidae.
• oarsman9n. A person who rows a boat, either alone or with others.
• oatcake13n. Any of many flat biscuits, or cakes, made from oatmeal.
• oatmeal9n. Meal made from rolled or round oats.

OB

• obelisk13n. A tall, square, tapered, stone monolith topped with a pyramidal point...
• obesity12n. The state of being obese.
• obliged11adj. Under an obligation to do something.
• obligee10n. The party owed an obligation by another party, the obligor.
• obligor10n. The party bearing a legal obligation to another party (the obligee).
• oblique18adj. Not erect or perpendicular; not parallel to, or at right angles from...
• obloquy21n. Abusive language.
• obovate12adj. Shaped like an egg, with the broad extremity located away from the base.
• obovoid13adj. Approximately obovate in shape.
• obscene11adj. Offensive to standards of decency or morality.
• obscure11adj. Dark, faint or indistinct.
• observe12v. To notice or view, especially carefully or with attention to detail.
• obtrude10v. To proffer (something) by force; to impose (something) on someone or...
• obverse12adj. Turned or facing toward the observer.
• obviate12v. To anticipate and prevent or bypass (something which would otherwise...
• obvious12adj. Easily discovered, seen, or understood; self-explanatory.

OC

• ocarina9n. A woodwind musical instrument that is closed at both sides to produce...
• occiput13n. The back part of the head or skull.
• occlude12v. To obstruct, cover, or otherwise block (an opening, a portion of an...
• oceanic11adj. Of or relating to the ocean.
• ocellar9adj. Of or relating to the ocellus or ocelli.
• ocellus9n. A simple eye consisting of a single lens and a small number of sensory...
• octagon10n. A polygon with eight sides and eight angles.
• octamer11n. An oligomer having eight subunits.
• octanol9n. Any of many isomers of the saturated aliphatic alcohol having eight...
• octopod12n. Any animal with eight feet or foot-like parts.
• octopus11n. Any of several marine molluscs of the order Octopoda, having no...
• octuple11adj. Eightfold.
• oculist9n. An eye doctor; an ophthalmologist or optometrist.

OD

• oddball11n. An eccentric or unusual person.
• oddness9n. The state or quality of being odd.
• odorant8n. Any substance that has a distinctive smell, especially one added to...
• odorous8adj. Having a distinctive odor.
• odyssey14n. An extended adventurous voyage, usually in search of home.

OE

• oersted8n. The CGS unit of magnetizing field (symbol Oe), defined as 1000/4π...
• oestrus7n. A biting fly of the genus Oestrus; a botfly.

OF

• offbeat15n. The beats not normally accented in a measure.
• offence15n. UK, Australia, New Zealand, and Canada standard spelling of offense.
• offense13n. A crime or sin.
• offeree13n. One to whom an offer is made.
• offerer13n. One who offers.
• offeror13n. One who makes an offer to another; someone who presents something to...
• offhand17adj. Without planning or thinking ahead.
• officer15n. One who has a position of authority in a hierarchical organization...
• offline13adj. Of a system, currently not connected (generally electrically) to a...
• offload14v. To unload.
• offside14adj. In an illegal position ahead of the ball, puck, etc.
• offsite13adj. Away from a main location; in a place not owned by a particular...
• offtake17v. To take off; take away, remove.
• oficina12n. A nitrate-producing factory in a Spanish-speaking country.
• ofrenda11n. A shrine of offerings to one's ancestors set up on the Day of the Dead.
• oftimes12adv. (elsewhere, archaic) Alternative form of ofttimes.

OI

• oilseed8n. The seed of any of several plants which are used commercially as a...
• oilskin11n. Cloth made from cotton and treated with oil and pigment to make it...

OK

• okadaic14adj. Of or pertaining to okadaic acid or its derivatives.
• okayish17adj. Somewhat okay; tolerable.

OL

• oldness8n. The state of being old; age.
• oldster8n. Someone who is old.
• olearia7n. Any of the genus Olearia of flowering plants in the family Asteraceae.
• olestra7n. A fat substitute (a glyceride of sucrose) that cannot be easily...
• olivary13adj. Shaped like an olive.
• olivine10n. Any of a group of olive green magnesium-iron silicate minerals that...
• ologist8n. One who studies some branch of learning, especially one ending in...
• oloroso7n. A type of sherry, darker and smoother than fino sherry, used as a base...

OM

• omakase13adj. Chef's choice.
• omental9adj. Of or pertaining to an omentum or the omenta.
• omentum11n. Either of two folds of the peritoneum that support the viscera.
• omicron11n. The 15th letter of the Classical and Modern Greek alphabets (16th in...
• ominous9adj. Of or pertaining to an omen or to omens; being or exhibiting an omen...
• omitted10adj. Left out; not included intentionally.
• omnibus11n. A bus (vehicle for transporting large numbers of people along roads).
• omurice11n. A Japanese dish consisting of an egg omelette with rice mixed with...

ON

• onanism9n. Masturbation.
• onboard10adj. Carried or used on or in a vehicle or vessel.
• oneiric9adj. Of or pertaining to dreams.
• oneness7n. The state of being one or undivided; unity.
• onerous7adj. Imposing or constituting a physical, mental, or figurative load which...
• oneshot10v. To kill or destroy with a single hit; to instakill.
• onesies7n. A call in any children's game, such as jacks, where one action must be...
• onfield11adj. That takes place on a sports field.
• ongoing9adj. Continuing, permanent, lasting.
• onigiri8n. A Japanese food made by putting ingredients into white rice, wrapping...
• onshore10adj. Moving from the sea towards the land.
• onsight11adj. Without having previously seen the terrain.
• onstage8adj. On the part of a stage that is visible to the audience.
• onwards11adv. Onward.

OO

• oobleck15n. A mixture of cornstarch and water with unusual physical properties.
• oolitic9adj. Made up of, or containing oolites.
• oopsies9v. Oops.
• ootheca12n. An egg case of any of the orthopteroid insects (such as cockroaches and...

OP

• opacity14n. The state or quality of being opaque, not allowing light to pass...
• opaline9adj. Resembling opal in having a milky white iridescence.
• opalite9n. Opal; some variety of it; an artificial mineral resembling it.
• opening10adj. Pertaining to the start or beginning of a series of events.
• operand10n. A quantity to which an operator is applied (in 3-x, the operands of the...
• operant9adj. That operates to produce an effect.
• operate9v. To perform a work or labour; to exert power or strength, physical or...
• opining10n. The act of giving one's opinion.
• opinion9n. A belief, judgment or perspective that a person has formed, either...
• opossum11n. Any American marsupial of the family Didelphidae in the order...
• oppidum14n. A large, defended Iron Age settlement associated with the Celtic La...
• opposed12adj. Acting in opposition; opposing.
• opposer11n. One who opposes, one who shows opposition.
• opposit11v. To posit or assume as a contradictory; negative or deny.
• oppress11v. To keep down by unjust force.
• optical11adj. Of or relating to sight; visual.
• optimal11adj. The best, most favourable or desirable, especially under some...
• optimum13n. The best or most favorable condition, or the greatest amount or degree...
• opulent9adj. Luxuriant, and ostentatiously magnificent.
• opuntia9n. Opuntia, a genus of cactus that includes such cacti as the prickly pear...

OR

• orality10n. The state of being oral.
• orangey11adj. Somewhat orange in colour.
• oration7n. A formal, often ceremonial speech.
• oratory10n. A private chapel or prayer room.
• orbital9adj. Of or relating to, or forming an orbit (such as the orbit of a moon...
• orbiter9n. An object that orbits another, especially a spacecraft that orbits a...
• orchard13n. A garden or an area of land for the cultivation of fruit or nut trees.
• ordered9adj. In order, not messy, tidy.
• orderer8n. A person who orders, or who places an order.
• orderly11adj. Neat and tidy; possessing order.
• ordinal8adj. Indicating position in a sequence.
• orebody13n. A mass or region of ore.
• oregano8n. A herb of the mint family, Origanum vulgare, having aromatic leaves.
• organdy12n. A fine, transparent type of muslin, usually stiffened.
• organic10adj. Pertaining to or derived from living organisms.
• organon8n. A set of principles that are used in science or philosophy.
• organum10n. A type of medieval polyphony which builds upon an existing plainsong.
• organza17n. A thin, stiff, sheer fabric that is made from silk or a synthetic yarn...
• orgueil8n. Pride.
• orifice12n. A mouth or aperture, such as of a tube, pipe, etc.; an opening.
• origami10n. The Japanese art of paper folding.
• orignal8n. A moose.
• orogeny11n. The process of mountain building by the upward folding of the Earth's...
• orotate7n. Any salt or ester of orotic acid.
• orotund8adj. Of a voice: characterized by clarity, fullness, smoothness, and...
• ortolan7n. A small European migratory bunting (Emberiza hortulana), once eaten...

OS

• osculum11n. The main opening in a sponge from which water is expelled.
• osmosis9n. The net movement of solvent molecules, usually water, from a region of...
• osmotic11adj. Relating to, or powered by, osmosis.
• osmunda10n. A fern of the genus Osmunda, especially the royal fern, Osmunda regalis.
• osseous7adj. Of, relating to, or made of bone; bony.
• ossuary10n. A container, receptacle, or building, such as an urn or vault, for...
• osteoid8adj. Of, pertaining to, or characteristic of bone; bonelike.
• osteoma9n. A benign bony tumour that typically grows on the skull.
• osteria7n. A small local restaurant in (usually rural) Italy.
• ostrich12n. A large flightless bird of the order Struthioniformes.

OT

• otolith10n. A small particle, composed mainly of calcium carbonate, found in the...
• otology11n. The branch of medicine that deals with the ear, its structure, function...
• ottoman9n. An upholstered sofa, without arms or a back, sometimes with a...

OU

• ouabain9n. A poisonous cardiac glycoside, g-strophanthin, found in the seeds of...
• ourself10pron. The reflexive of the royal or editorial we: myself (as used by one who...
• ousting8n. The act by which somebody is ousted; an ouster.
• outback15n. The most remote and desolate areas of Australia; the desert and areas...
• outcall9n. A visit by a provider of some service, such as a massage therapist or a...
• outcast9v. To cast out; to banish.
• outcome11n. That which is produced or occurs as a result of an event or process.
• outcrop11n. A piece of land that stands out (usually into water) from the land...
• outdate8v. To make obsolete or out of date.
• outdoor8adj. Situated in, designed to be used in, or carried on in the open air.
• outdraw11v. To extract or draw out.
• outfall10n. A quarrel; a falling out.
• outfeed11n. A conveyor that pulls split firewood away from the processor and into a...
• outflow13n. The process of flowing out.
• outgrow11v. To become too big in size or too mature in age or outlook to continue...
• outland8adj. Provincial: from a province (of the same land).
• outlast7v. To live, last or remain longer than.
• outlier7n. A person or thing situated away from the main body or outside its...
• outline7n. A line marking the boundary of an object figure.
• outlive10v. To live longer than; continue to live after the death of; overlive...
• outlook11n. A place from which something can be viewed.
• outmost9n. That which is outmost.
• outpace11v. To go faster than; to exceed the pace of.
• outplay12v. To excel or defeat in a game; to play better than.
• outport9n. A port city or harbor which is secondary to a main port; it may be a...
• outpost9n. A military post stationed at a distance from the main body of troops.
• outpour9n. The act of pouring out.
• outrace9v. To travel faster than another in a competitive event.
• outrage8n. An excessively violent or vicious attack; an atrocity.
• outrank11v. To be of a higher rank than.
• outride8n. A trip on a horse outside an enclosed area, a trip on a horse in the...
• outsail7v. To sail faster or further than.
• outsell7v. To sell more than; to surpass in sales.
• outshot10n. An extension to a building.
• outside8n. The part of something that faces out; the outer surface.
• outsize16n. An unusually large garment size.
• outsole7n. The underside of a shoe or other footwear, which makes contact with the...
• outspan9v. To release oxen from a harness.
• outstay10v. To stay beyond or longer than.
• outtake11n. A portion of a recording (a take) that is not included in the final...
• outturn7n. An amount produced during a specified period; output or turnout.
• outvote10v. To cast more votes than another.
• outward11adj. Outer; located towards the outside.
• outwash13n. The sediment (mostly sand and gravel) deposited by water flowing from a...
• outwear10v. To outlast; to survive longer than: to outlive.
• outwell10v. To well outward; to issue forth.
• outwith13prep. Outside; beyond; outside of.
• outwork14v. To work more, faster, or harder than (someone else).
• outworn10adj. No longer usable.
• ouvrier10n. A French labourer or manual worker.

OV

• ovarian10adj. Relating to the ovaries.
• ovaries10n. Synonym of balls (“courage”) (said of women).
• ovation10n. A victory ceremony of less importance than a triumph.
• overact12v. To act in an exaggerated manner.
• overage11adj. Having an age that is greater than a stipulated minimum.
• overall10adj. All-encompassing, all around.
• overarm12adj. Throwing while having the hand above the elbow.
• overawe13v. To restrain, subdue, or control by awe; to cow.
• overbid13v. To make an excessively high offer to pay or accept a price.
• overcut12v. To cut excessively.
• overdub13v. To record a part along with an already recorded part or parts.
• overdue11adj. Late; especially, past a deadline or too late to fulfill a need.
• overeat10v. To eat too much.
• overfed14adj. Excessively fed; given too much to eat; having had too much to eat.
• overfit13v. To use a statistical model that has too many parameters relative to the...
• overfly16v. To fly over something.
• overhit13v. To hit too far or too hard.
• overjet17n. The extent of horizontal overlap of the maxillary central incisors over...
• overlap12v. To extend over and partly cover something.
• overlay13v. To lay, spread, or apply (something) over or across (something else)...
• overlie10v. To lie over or upon.
• overman12n. A person who supervises others; a supervisor, especially in a mine.
• overmix19v. To mix too thoroughly.
• overpay15v. To pay too much.
• overrun10v. To defeat an enemy and invade in great numbers, seizing the enemy...
• oversee10v. To survey, look at something in a wide angle.
• overset10v. To knock over or overturn (someone or something); to capsize, to upset.
• overtax17v. To tax to an excessive degree.
• overtly13adv. In an overt manner; publicly; openly.
• overtop12v. To be higher than; to rise over the top of.
• overuse10v. To use too much of (something); to use (it) too often.
• oviduct13n. A duct through which an ovum passes from an ovary to the uterus or to...
• ovulate10v. To produce eggs or ova.

OW

• owlbear12n. A monstrous creature resembling a bear with a beak.
• ownself13pron. (One's) self; used with a preceding possessive adjective to form a...

OX

• oxalate14n. Any salt or ester of oxalic acid.
• oxblood17n. A dark brownish-red colour.
• oxidant15n. An oxidizing agent.
• oxidase15n. Any of many enzymes which catalyze oxidation reactions, especially ones...
• oxidize24v. To combine with oxygen or otherwise make an oxide.
• oxonian14adj. Containing oxygen.
• oxonium16n. Any univalent oxygen cation derived from water, the simplest of which...

OY

• oyakata14n. A retired rikishi who has reached a certain standing and either becomes...

Questions about these words

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

Word.ws lists 249 seven-letter words that start with O, plus 841 rare ones.

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

outside, officer, opening, opinion, overall, ordered, obvious and opposed.

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

oxidize scores 24 points with the standard letter tile values.

Related word lists

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