4 Letter Words That Start With O


Adjective : Discontinued; ended or concluded.

Adjective : (professional wrestling slang) wrestler or faction that is popular with the audience.

Verb : Thoroughly; completely; from beginning to end.


Adjective : (usually not comparable) Not closed.

Adjective : Able to be accessed (physically).

Adjective : Able to have something pass through or along it.


Verb : (frequency) One and only one time.

Verb : (temporal location) Formerly; during some period in the past.

Verb : (chiefly obsolete) At any time; ever.


Adjective : Alone in a category.

Adjective : Singularly superior; the best.

Adjective : Without sibling; without a sibling of the same gender.


Noun : A legal obligation.

Noun : (law) Burden of proof, onus probandi.

Noun : Stigma.


Adjective : (mathematics, of a function) Assuming each of the values in its codomain; having its range equal to its codomain.


Noun : The ratio of the probability of an event happening to that of it not happening.

Noun : The ratio of winnings to stake in betting situations.

Noun : (chess) An advantage given to a weaker opponent in order to equalize the game when playing casually, usually by removing one of the stronger player's pieces or by giving the weaker player more time.


Noun : (music) A work of music or set of works with a specified rank in an ordering of a composer's complete published works.

Noun : A work, especially of art.


Noun : Something which portends or is perceived to portend either a good or evil event or circumstance in the future, or which causes a foreboding; a portent or augury.

Noun : A thing of prophetic significance.

Verb : (transitive) To be an omen of.



Verb : (transitive) To leave out or exclude.

Verb : (intransitive) To fail to perform.

Verb : (transitive, law, of text) To delete or remove; to strike.


Verb : (transitive, intransitive) To stare at (someone or something), especially impertinently, amorously, or covetously.

Noun : An impertinent, flirtatious, amorous or covetous stare.

Noun : (Polari, usually in the plural) An eye.


Noun : A male given name from the Germanic languages.

Noun : A surname from the Germanic languages

Noun : A place in the United States


Noun : A solemn pledge or promise that invokes a deity, a ruler, or another entity (not necessarily present) to attest the truth of a statement or sincerity of one's desire to fulfill a contract or promise.

Noun : A statement or promise which is strengthened (affirmed) by such a pledge.

Noun : A light, irreverent or insulting appeal to a deity or other entity.


Noun : A chamber used for baking or heating.

Noun : (colloquial) A very hot place.

Verb : (transitive, colloquial, informal) To cook in an oven


Noun : (informal, veganism) A person who is not vegan; one with no particular dietary restrictions.


Noun : (mineralogy) A banded variety of chalcedony, a cryptocrystalline form of quartz.

Noun : A jet-black color, named after the gemstone.

Noun : Any of various lycaenid butterflies of the genus Horaga.


Noun : A sea mammal (Orcinus orca) related to dolphins and porpoises, commonly called the killer whale.


Noun : Alternative spelling of OK [Endorsement; approval; acceptance; acquiescence.]

Verb : Alternative spelling of OK [(transitive) To approve; to accept; to acquiesce to.]

Adjective : Alternative spelling of OK [All right, acceptable, permitted.]


Noun : Tanning liquor, an aqueous extract of vegetable matter (tanbark, sumac, etc.) in a tanning vat used to tan leather.

Noun : An oozing, gentle flowing, or seepage, as of water through sand or earth.

Noun : (obsolete) Secretion, humour.


Adjective : (relational) Relating to the mouth.

Adjective : (pharmacology) Done or taken by the mouth.

Adjective : (phonetics, of a speech sound) Pronounced by the voice resonating in the mouth, as the vowels in English.


Noun : (foods) A cookie made of two wafers joined with a sugary filling, particularly a Nabisco cookie with two alkalized cocoa-powder wafers around a white creme filling.

Noun : (US, derogatory, ethnic slur) A black person considered to have overly assimilated to white culture, a black race traitor.

Noun : Alternative letter-case form of Oreo. [(foods) A cookie made of two wafers joined with a sugary filling, particularly a Nabisco cookie with two alkalized cocoa-powder wafers around a white creme filling.]


Noun : An elongated round shape resembling an egg or ellipse.

Noun : A thing having such a shape, such as an arena.

Noun : (mathematics) In a projective plane, a set of points such that no three are collinear and there is a unique tangent line at each point.


Verb : (transitive) To do as ordered by (a person, institution etc), to act according to the bidding of.

Verb : (intransitive) To do as one is told.

Verb : (obsolete, intransitive) To be obedient, compliant (to a given law, restriction etc.).


Noun : The edible immature mucilaginous seed pod (properly, capsule) of the Abelmoschus esculentus.

Noun : The flowering mallow plant Abelmoschus esculentus itself, now commonly grown in the tropics and warmer parts of the temperate zones.



Noun : Any smell, whether fragrant or offensive.

Noun : (figuratively) A strong, pervasive quality.

Noun : (figuratively, uncountable) Esteem.


Noun : od


Noun : (mythology) A type of brutish giant from folk tales that eats human flesh.

Noun : (figuratively) A brutish man reminiscent of the mythical ogre.

Noun : A city in central Latvia


Noun : Originally, secret rites or ceremonies, typically involving riotous and dissolute behaviour, including dancing, drunkenness and indiscriminate sexual activity, undertaken in honour of various pagan gods or goddesses (such as Attis, Bacchus, Ceres, Dionysus, Osiris, etc). [from Template:SAFESUBST: c.]

Noun : A gathering of people to engage in group sex.

Noun : Excessive indulgence in a specified activity.


Noun : (mineralogy) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO₂·nH₂O.

Noun : (gemology) A precious gem, an iridescent gemstone found in the opal-silica mineral substrate (potch)

Noun : (biology, genetics, biochemistry) A colloquial name used in molecular biology referring to a particular stop codon sequence, "UGA."


Verb : (transitive) To expel; to remove.


Noun : A rich, thick, Spanish stew consisting of meat and vegetables.

Noun : (figuratively) A medley or mixture; a hotchpotch.

Noun : (figuratively) A collection of various musical, theatrical or other artistic works; a miscellany.


Adjective : (anatomy) Of, relating/pertaining to, or located near the ear.


Noun : (informal) An extraordinary individual.

Noun : A small marble of little worth in children's games.

Noun : (UK) A conker that has won one match.


Noun : (aviation) A type of energy-absorbing landing gear strut in which sudden compression or extension of the strut causes a gas-filled chamber to push or pull a piston which forces oil through a small orifice, resulting in absorption of energy through viscous effects.

Noun : (US) The various fats and oils that go into the making of margarine.

Noun : (US, dated) Margarine.


Noun : (UK dialectal) Mud.


Noun : (architecture) A double curve in the shape of an elongated S; an object of that shape.

Noun : (architecture) A pointed arch made from two ogees.

Noun : (mathematics) An inflection point.


Noun : (Norse mythology and paganism) A major Germanic god, often described as chief of the pantheon, in his Norse form a member of the Æsir, married to Frigg and associated with knowledge, poetry and war. Wednesday refers to him by way of interpretatio germanica.


Noun : A perennial herb of species Ligusticum porteri, found in parts of the Rocky Mountains and northern Mexico.

Noun : (US) Initialism of Occupational Safety and Health Administration.


Noun : A country in Western Asia, in the Middle East. Official name: Sultanate of Oman. Capital: Muscat.


Noun : A soprano and melody wind instrument in the modern orchestra and wind ensemble. It is a smaller instrument and generally made of grenadilla wood. It is a member of the double reed family.

Noun : (World War II era, joint US/RAF) radiotelephony clear-code word for the letter O.


Noun : (sports) A senior or first team (as opposed to a reserves team).

Noun : (UK, prison slang) The cells located on the ground floor.


Noun : (archaic) Death of a person.

Noun : (Christianity, historical) A mass or other service held for the soul of a dead person.

Noun : A record of a person's death.


Noun : (cytology) The female gamete in animals; the egg cell.


Noun : (Islam) Omar bin al-Khattab

Noun : A male given name from Arabic


Noun : Any of several antelopes, of the genus Oryx, native to Africa, which have long, straight horns


Noun : the name used by UK-based Tangerine Computer Systems for a series of 6502-based home computers sold in the 1980s, primarily in Europe.


Noun : A cooking-pot or earthenware jar used in Spain and Spanish-speaking countries.

Noun : A pot used for cooling water by evaporation in Latin America.

Noun : An unglazed earthenware pot, buried to provide slow steady irrigation.


Noun : (informal) Something that causes discomfort or pain.

Verb : (intransitive) To exclaim "ouch!" in discomfort or pain.

Noun : A surname.


Noun : A surname transferred from the given name, notably of the American revolutionary hero James Otis and the innovator and industrialist Elisha Otis.

Noun : (chiefly US) A male given name from the Germanic languages, transferred from the surname.

Noun : An Otis elevator.


Noun : A surname.

Noun : A village in Larissa regional unit, Greece.

Noun : A village in Thessaloniki regional unit, Greece.


Noun : (darts) A line behind which a player's front foot must be placed when throwing a dart.


Noun : A minor mistake or unforseen difficulty.

Verb : (intransitive, colloquial) To make a mistake; to blunder.

Noun : Abbreviation of object-oriented programming system.


Noun : A river in central Europe, that flows from the Czech Republic through Poland and Germany to the Baltic Sea.


Noun : Any of various large, colourful, deep-bodied pelagic fish of the family Lamprididae.


Adjective : (rare) evil-smelling; fetid.



Noun : A mass of oat plants (genus Avena, especially Avena sativa).

Noun : Seeds of an oat plant, especially prepared as food.


Noun : The sound made by a pig, or an imitation thereof.

Verb : (intransitive) Of a pig or in imitation thereof, to make its characteristic sound.


Noun : A form of pasta the size and shape of grains of rice or barley; often used in soups.


Adjective : Of, relating to, or resembling an ox; oxlike


Noun : The third-largest island of Hawaii, included in the City and County of Honolulu.


Noun : (heraldry) A bordure that runs around the outline of a shield without touching the edge.

Noun : (heraldry) The wreath, or chaplet, surmounting or encircling the helmet of a knight and bearing the crest; a torse.

Noun : (architecture) A fillet under the ovolo of a capital.


Noun : A 1st century BC Roman poet.

Noun : A male given name from Latin of mainly historic use.

Noun : A statutory town in Sedgwick County, Colorado.



Noun : (Britain) A kiln for drying tobacco, malt and especially hops.


Noun : A fish, the ide, Leuciscus idus.


Noun : A state of the United States. Capital and largest city: Columbus.

Noun : A river in the United States, flowing 981 miles from the confluence of the Allegheny and Monongahela at Pittsburgh into the Mississippi at Cairo, Illinois.

Noun : A locale in the United States; named for the state.


Noun : A male given name from Welsh, an anglicization of Welsh Owain.

Noun : A male given name from Irish, an anglicization of Irish Eoghan.

Noun : A surname from Welsh [in turn originating as a patronymic] derived from the given name.


Noun : An oblast of Russia.

Noun : A city, the administrative center of Omsk Oblast, Russia, the seventh-largest in the country by population.


Noun : Acronym of Organization of Petroleum Exporting Countries.


Noun : A county and municipality, the capital city of Norway. Formerly called Christiania and Kristiania.

Noun : A tiny city in Marshall County, in northwest Minnesota, United States.

Noun : An unincorporated community in Vernon Township, Dodge County, Minnesota, United States.


Noun : A surname from Middle English.


Noun : (uncountable) An anise-flavoured aperitif, originating in Greece.

Noun : (countable) A serving of this drink.


Noun : Various rivers in England.

Noun : River Ouse, Yorkshire: A river in North Yorkshire and East Riding of Yorkshire.

Noun : River Ouse, Sussex: A river in both West Sussex and East Sussex.


Noun : A surname from Cornish.


Verb : Away from the inside, centre or other point of reference.

Verb : Away from home or one's usual place.

Verb : Outside; not indoors.


Adjective : Relating to or resembling oil.

Adjective : Covered with or containing oil.

Adjective : (figuratively) Excessively friendly or polite but insincere.


Noun : A female given name from Russian.

Noun : A transliteration of the Russian female given name О́льга (Ólʹga).


Noun : (historical units of measure) A former small Hebrew unit of dry volume equal to about 2.3 L or 2.1 quarts.

Noun : A vessel of one omer.

Noun : (Judaism) The sheaf of barley offered on the second day of Passover.


Noun : A city and commune of the department of the Val-de-Marne, region of Île-de-France, France.

Noun : (by ellipsis) Paris-Orly Airport.


Noun : (slang, among criminal gangs) An opponent; an enemy; the opposition

Noun : A city in Alabama.

Noun : Initialism of other people's problems.


Noun : Opel Automobile GmbH, usually shortened to Opel, is a German automobile manufacturer which has been a subsidiary of Stellantis since 16 January 2021.

Noun : a 1988 album compiled from recordings made by former Pink Floyd frontman Syd Barrett between 1968 and 1970.

Noun : Opel Automobile is a German car manufacturer.


Noun : A cry of "oyez".

Verb : (transitive, rare) To proclaim with a cry of "oyez".



Adjective : Of or pertaining to the quality of something that oozes.


Noun : (historical) A silver coin of Ancient Greece.

Noun : (historical) A weight, equivalent to one sixth of a drachma.


Noun : A company that produces parts to be sold under another company's brand.

Noun : A value-added reseller; company selling goods assembled from other companies' parts.

Noun : All makers prior to initial retail sale, in contrast to aftermarket.


Noun : A city, port, and province of Algeria.

Noun : A male given name from Irish.


Noun : Alternative form of odeon [An ancient Greek or Roman building used for performances of music and poetry.]


Verb : Misspelling of are.




Noun : A city in Ventura County, California, United States.


Noun : A surname from Dutch.


Adjective : Archaic spelling of old. [Of an object, concept, relationship, etc., having existed for a relatively long period of time.]


Noun : (law, archaic) A hearing in a civil case which is based on the content of a document, in which the plaintiff is required to produce the document.


Noun : (US, ethnic slur, slang) A white person.

Adjective : (US, ethnic slur, slang) White; white-skinned.


Noun : (television, film) A small lamp positioned over the camera, sometimes used to produce catchlights in the subject's eyes.

Noun : An Off-Broadway Theater Award, given annually to theatre artists and groups in New York City.

Noun : A surname from French.

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