Nouns starting with O that are validated

• on the qui vive — Noun – English ～ lively attentiveness
• OB-vogn — Noun – Danish ～ større bil udstyret til brug for radio- og tv-opta ...
• order Volvocales — Noun – English ～ chiefly freshwater green algae; solitary or colonial
• Otto von Bismarck — Noun – English ～ German statesman under whose leadership Germany was united (1815-1898)
• Origanum vulgare — Noun – English ～ aromatic Eurasian perennial
• Otto Wagner — Noun – English ～ Austrian architect and pioneer of modern architecture (1841-1918)
• Otto Heinrich Warburg — Noun – English ～ German biochemist who pioneered the use of chemical techniques in biological investigations; noted for studies of cellular respiration (1883-1970)
• oil-water interface — Noun – English ～ an interface forming the boundary between the non-miscible liquids oil and water
• Okeechobee Waterway — Noun – English ～ a waterway used by small boats to travel between the Atlantic Ocean and the Gulf of Mexico through Lake Okeechobee and the Caloosahatchee Canal and the Caloosahatchee River
• one-way street — Noun – English ～ unilateral interaction; "cooperation cannot be a one-way street"
• one-way light time — Noun – English ～ the elapsed time it takes for light (or radio signals) to travel between the Earth and a celestial object
• one-way street — Noun – English ～ a street on which vehicular traffic is allowed to move in only one direction
• Organization for the Prohibition of Chemical Weapons — Noun – English ～ international organization for chemical disarmament; administers the Chemical Weapons Convention
• open weave — Noun – English ～ a weave in which warp threads never come together, leaving interstices in the fabric
• orb-weaver — Noun – English ～ spiders that spin orb webs; cosmopolitan in distribution
• orb-weaving spider — Noun – English ～ a spider that spins a circular (or near circular) web
• orb web — Noun – English ～ a circular spider web
• oil well — Noun – English ～ a well that yields or has yielded oil
• Orson Welles — Noun – English ～ United States actor and filmmaker (1915-1985)
• Oliver Wendell Holmes — Noun – English ～ United States writer of humorous essays (1809-1894)

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