Word.ws English Dictionary

4-Letter Words Starting with O

There are 127 four-letter words that start with O on Word.ws, from oaks to oyez. The most common are only, over, once, open and ones.

Meanings from Wiktionary. Not an official Scrabble, Words With Friends or Wordle word list.

All 127 four-letter words that start with O

OA

  • oaks8n. A stakes race in which entry is restricted to 3-year-old fillies.
  • oaky11adj. Resembling or characteristic of the oak tree or its wood.
  • oart4n. A coconut plantation.
  • oast4n. A kiln for drying tobacco, malt and especially hops.
  • oath7n. A solemn pledge or promise that invokes a deity, a ruler, or another...
  • oats4n. A mass of oat plants (genus Avena, especially Avena sativa).
  • oaty7adj. Containing oats.

OB

  • obbo8n. Police observation.
  • obby11n. An obstacle course.
  • obex13n. A small, crescentic fold of white matter that covers the inferior angle...
  • obey9v. To do as ordered by (a person, institution etc), to act according to...
  • obit6n. A mass or other service held for the soul of a dead person.
  • oboe6n. A soprano and melody wind instrument in the modern orchestra and wind...
  • obol6n. Synonym of obolus: a silver coin of Ancient Greece.

OC

  • ocha9n. Japanese tea, usually green tea.
  • oche9n. A line behind which a player's front foot must be placed when throwing...
  • octa6n. The proportion of the sky that is obscured by clouds, in eighths (one...
  • octo6n. An octopus (safety device).

OD

  • odal5n. Among the early and medieval Teutonic peoples, especially...
  • odds6n. The ratio of the probability of an event happening to that of it not...
  • odee5adv. Very, extremely.
  • oden5n. A Japanese one pot winter dish, of varying ingredients.
  • odor5n. Any smell, whether fragrant or offensive.
  • odum7n. Synonym of mvule ("a tree of species Milicia excelsa").

OE

OF

  • offa10prep. Off of.
  • offy13n. An off-licence.

OG

  • ogee5n. A double curve in the shape of an elongated S; an object of that shape.
  • oggy9n. A Cornish pasty.
  • ogle5v. To stare at (someone or something), especially impertinently...
  • ogre5n. A large, grotesque, brutish humanoid monster, typically marked by great...

OH

  • ohel7n. A structure erected over the grave of a great and righteous person.
  • ohia7n. In Hawaii: the lehua, Metrosideros polymorpha (native to Hawaii).

OI

  • oily7adj. Covered with or containing oil.
  • oink8interj. Representing the grunting sound made by a pig.
  • oint4v. To anoint.

OJ

  • ojha14n. A sorcerer or folk healer in parts of India and Nepal.

OK

  • oker8n. Interest on money; usury; increase.
  • okey11n. A Turkish game in which players attempt to collect certain groups of...
  • okra8n. The edible immature mucilaginous seed pod (properly, capsule) of the...
  • okta8n. One eighth of the total area of the celestial dome; used as a measure...

OL

  • olay7n. Palm leaves, prepared for being written upon with a steel-tipped stylus.
  • olds5n. One's parents.
  • oleh7n. A Jew who has recently made aliyah to Israel; an immigrant to Israel.
  • oleo4n. A type of energy-absorbing landing gear strut in which sudden...
  • olid5adj. Evil-smelling; fetid.
  • olio4n. A rich, thick, Spanish stew consisting of meat and vegetables.
  • olla4n. A cooking-pot or earthenware jar used in Spain and Spanish-speaking...
  • olpe6n. Originally, a leather flask or vessel for oils or liquids; afterward...

OM

  • omar6n. A glacial erratic piece of (typically smooth) dark siliceous greywacke...
  • omen6n. Something which portends or is perceived to portend either a good or...
  • omer6n. A former small Hebrew unit of dry volume equal to about 2.3 L or 2.1...
  • omic8adj. Of or pertaining to an ome or omics.
  • omit6v. To leave out or exclude.
  • omni6n. A person or animal who is not vegan; one with no particular dietary...
  • omul6n. Any of the salmon-like fish of species Coregonus migratorius (syn....

ON

  • once6adv. One and only one time.
  • onde5n. Breath.
  • oneg5n. A casual festive gathering on Friday night after the first Shabbat...
  • onek8n. A One-pronged fork.
  • oner4n. An extraordinary individual or thing.
  • ones4n. A senior or first team (as opposed to a reserves team).
  • ongo5v. To be ongoing (occurring, happening); to last, proceed or continue.
  • only7adj. Alone in a category.
  • onos4n. Synonym of epinetron (“Attic pottery item”).
  • onto4prep. Arriving upon or on top of (speaking of a physical or metaphorical...
  • onus4n. A legal obligation.
  • onya7interj. Good on you.
  • onyx14n. A banded variety of chalcedony, a cryptocrystalline form of quartz.
  • onza13n. A traditional Spanish unit of mass, equivalent to about 28.76 g.

OO

  • oooh7interj. Elongated form of ooh.
  • oops6interj. Used to acknowledge a small mistake or accident.
  • oose4n. Fluff, particularly from a textile source such as cotton or wool.
  • ooze13n. Tanning liquor, an aqueous extract of vegetable matter (tanbark, sumac...
  • oozy16adj. Of or pertaining to the quality of something that oozes.

OP

  • opah9n. Any of various large, colourful, deep-bodied pelagic fish of the family...
  • opal6n. A mineral consisting, like quartz, of silica, but inferior to quartz in...
  • open6adj. Able to have something pass through or along it.
  • oppa8n. An affectionate term of address for an older brother or somewhat older...
  • oppo8n. A friend, associate or colleague.
  • oppy11adj. Characteristic of an opp; inimical, hostile.
  • opry9n. Opera.
  • opus6n. A work of music or set of works with a specified rank in an ordering of...

OR

  • oral4adj. Relating to the mouth.
  • orby9adj. Having characteristics of an orb.
  • orca6n. A sea mammal (Orcinus orca) related to dolphins and porpoises, commonly...
  • orda5n. A political and military organizational structure used by Turkic and...
  • ordo5n. A musical phrase constructed from one or more statements of one modal...
  • orge5v. To indulge in riotous jollity.
  • orgo5adj. Organic.
  • orgy8n. A secret rite or ceremony, typically involving riotous and dissolute...
  • orle4n. A bordure that runs around the outline of a shield without touching the...
  • orlo4n. A Spanish wind instrument, possibly a crumhorn.
  • orra4adj. Superfluous; odd, unmatched, left over.
  • orse4adv. Otherwise.
  • oryx14n. Any of several antelopes, of the genus Oryx, native to Africa, which...
  • orzo13n. A form of pasta the size and shape of grains of rice or barley; often...

OS

  • oses4n. The various sugars ending in -ose, such as sucrose, lactose, glucose...
  • osha7n. A perennial herb of species Ligusticum porteri, found in parts of the...
  • oshi7n. A person's favorite VTuber, idol, or character, especially one they...

OT

  • otic6adj. Of, relating/pertaining to, or located near the ear.
  • otsu4adj. In Old Japanese, one of two sets of vowels of uncertain pronunciation...
  • otta4n. Flour.

OU

  • ouch9interj. An expression of one's own physical pain.
  • oued5n. Synonym of wadi.
  • ough8interj. The sound of a grunt or groan or cough.
  • ouji11n. A masculine fashion style originating in Japan, based on Victorian and...
  • ouma6n. A grandmother.
  • oupa6n. A grandfather.
  • ours4pron. Excluding the person(s) being addressed (exclusive ours).
  • oust4v. To expel; to remove.
  • outa4n. An old black man.
  • ouzo13n. An anise-flavoured aperitif, originating in Greece.

OV

  • oval7n. A two-dimensional one.
  • oven7n. A chamber used for baking or heating.
  • over7adj. Finished; ended; concluded.
  • ovum9n. The female gamete in animals; the egg cell.

OW

  • owed8adj. That owes.
  • ower7n. A person who owes something, especially money.
  • owie7interj. Synonym of ow.
  • owly10adj. Resembling or characteristic of an owl.

OX

  • oxen11adj. Of, relating to, or resembling an ox; oxlike.
  • oxer11n. A type of horse jump with two rails that may be set even or uneven.
  • oxic13adj. Containing oxygen.
  • oxon11n. Any organic compound derived from another in which a phosphorus-sulfur...

OY

  • oyer7n. A hearing in a civil case which is based on the content of a document...
  • oyez16interj. Hear ye. Attend. (Called by public criers or in court usually three...
38 rare four-letter words that start with O

Questions about these words

How many four-letter words that start with O are there?
Word.ws lists 127 four-letter words that start with O, plus 38 rare ones.
What are common four-letter words that start with O?
only, over, once, open, ones, onto, odds and oral.
Which of the four-letter words that start with O has the highest letter score?
oyez scores 16 points with the standard letter tile values.

Related word lists

Source and license

Word lists and meanings adapted from the Wiktionary entry of each word. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws left out names, abbreviations, misspellings and offensive words, and ordered the most common words by how often they appear in English (wordfreq). Meanings from Wiktionary; this is not an official Scrabble, Words With Friends or Wordle word list. Wiktionary data of 2026-09-02.

Cite this page: “4-Letter Words Starting with O: 127 Words.” Word.ws, https://word.ws/words/4-letter/starting-with-o. Based on Wiktionary, CC BY-SA 4.0.