Words starting with O that are validated

• Ob River — Noun – English ～ a major river of western Siberia; flows generally northward and westward to the Gulf of Ob and the Kara Sea
• Orinoco River — Noun – English ～ a South American river 1,500 miles long; flows into the South Atlantic
• Orange River — Noun – English ～ a river in South Africa that flows generally westward to the Atlantic Ocean
• Ottawa river — Noun – English ～ a river in southeastern Canada that flows along the boundary between Quebec and Ontario to the Saint Lawrence River near Montreal
• Ouachita River — Noun – English ～ a river that rises in western Arkansas and flows southeast into eastern Louisiana to become a tributary of the Red River
• Ouse River — Noun – English ～ a river in northeastern England that flows generally southeastward to join the Trent River and form the Humber
• Osage River — Noun – English ～ a river in Missouri that is a tributary of the Missouri River
• Ohio River — Noun – English ～ a river that is formed in western Pennsylvania and flows westward to become a tributary of the Mississippi River
• Oder River — Noun – English ～ a European river; flows into the Baltic Sea
• oriental roach — Noun – English ～ dark brown cockroach originally from orient now nearly cosmopolitan in distribution
• off-roader — Noun – English ～ a bicycle with a sturdy frame and fat tires; originally designed for riding in mountainous country
• Otto Robert Frisch — Noun – English ～ British physicist (born in Austria) who with Lise Meitner recognized that Otto Hahn had produced a new kind of nuclear reaction which they named nuclear fission; Frisch described the explosive potential of a chain nuclear reaction (1904-1979)
• Oral Roberts — Noun – English ～ United States evangelist (born 1918)
• Oscar Robertson — Noun – English ～ United States basketball guard (born in 1938)
• Oscar Palmer Robertson — Noun – English ～ United States basketball guard (born in 1938)
• oysters Rockefeller — Noun – English ～ oysters spread with butter and spinach and seasonings and baked on the half shell
• order Rodentia — Noun – English ～ small gnawing animals: porcupines; rats; mice; squirrels; marmots; beavers; gophers; voles; hamsters; guinea pigs; agoutis
• onion roll — Noun – English ～ yeast-raised roll flavored with onion
• operating room — Noun – English ～ a room in a hospital equipped for the performance of surgical operations; "great care is taken to keep the operating rooms aseptic"
• order Rosales — Noun – English ～ in some classifications this category does not include Leguminosae

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