Nouns starting with O that are validated

• Oliver Wendell Holmes Jr. — Noun – English ～ United States jurist noted for his liberal opinions (1841-1935)
• Oregon white oak — Noun – English ～ small deciduous tree of western North America with crooked branches and pale grey bark
• off-white — Noun – English ～ a shade of white the color of bleached bones
• oceanic whitetip shark — Noun – English ～ large deep-water shark with white-tipped dorsal fin; worldwide distribution; most dangerous shark
• Oscar Wilde — Noun – English ～ Irish writer and wit (1854-1900)
• Oscar Fingal O'Flahertie Wills Wilde — Noun – English ～ Irish writer and wit (1854-1900)
• oriel window — Noun – English ～ a projecting bay window corbeled or cantilevered out from a wall
• oval window — Noun – English ～ fenestra that has the base of the stapes attached to it
• one-flowered wintergreen — Noun – English ～ delicate evergreen dwarf herb of north temperate regions having a solitary white terminal flower; sometimes placed in genus Pyrola
• oil of wintergreen — Noun – English ～ oil or flavoring obtained from the creeping wintergreen or teaberry plant
• Owen Wister — Noun – English ～ United States writer (1860-1938)
• old witch grass — Noun – English ～ North American grass with slender brushy panicles; often a weed on cultivated land
• old witchgrass — Noun – English ～ North American grass with slender brushy panicles; often a weed on cultivated land
• old wives' tale — Noun – English ～ a bit of lore passed on by word of mouth
• old woman — Noun – English ～ a woman who is old
• old woman — Noun – English ～ herb with greyish leaves found along the east coast of North America; used as an ornamental plant
• opossum wood — Noun – English ～ medium-sized tree of West Virginia to Florida and Texas
• old-man-of-the-woods — Noun – English ～ edible mild-tasting mushroom found in coniferous woodlands of eastern North America
• oblong woodsia — Noun – English ～ a common rock-inhabiting fern of northern temperate regions having rusty-brown stipes and lanceolate pinnate fronds
• opposite word — Noun – English ～ a word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each other; "to him the antonym of `gay' was `depressed'"

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