Words starting with O that are validated

• one percent — Noun – English ～ one part in a hundred equal parts
• olfactory perception — Noun – English ～ the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form; "she loved the smell of roses"
• ocean perch — Noun – English ～ North Atlantic rockfish
• ocean perch — Noun – English ～ large fish of northern Atlantic coasts of America and Europe
• order Perciformes — Noun – English ～ one of the largest natural groups of fishes of both marine and fresh water: true perches; basses; tuna
• order Percomorphi — Noun – English ～ one of the largest natural groups of fishes of both marine and fresh water: true perches; basses; tuna
• Ordovician period — Noun – English ～ from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
• orbit period — Noun – English ～ the time it takes to complete one full orbit around a celestial body; "the orbit period depends on the altitude of the satellite"
• overtime period — Noun – English ～ a period of overtime play to resolve a tie; e.g. basketball
• order Perissodactyla — Noun – English ～ nonruminant ungulates: horses; tapirs; rhinoceros; extinct forms
• order Peronosporales — Noun – English ～ order of chiefly parasitic lower fungi: Albuginaceae and Peronosporaceae and Pythiaceae
• Oliver Hazard Perry — Noun – English ～ United States commodore who led the fleet that defeated the British on Lake Erie during the War of 1812; brother of Matthew Calbraith Perry (1785-1819)
• old person — Noun – English ～ an elderly person
• one-person — Adjective – English ～ designed for or restricted to a single person; "a one-man show"; "a one-person tent"; "Sarah Silverman's hilarious one-woman show"
• oral personality — Noun – English ～ (psychoanalysis) a personality characterized either by generous optimism or aggressive and ambitious selfishness; formed in early childhood by fixation during the oral stage of development
• obsessive-compulsive personality — Noun – English ～ personality characterized by a strong need to repeat certain acts or rituals
• Oxalis pes-caprae — Noun – English ～ South African bulbous wood sorrel with showy yellow flowers
• Ole-Peter — First name – Danish
• Organization of Petroleum-Exporting Countries — Noun – English ～ an organization of countries formed in 1961 to agree on a common policy for the production and sale of petroleum
• order Pezizales — Noun – English ～ order of mostly saprophytic fungi having cup-shaped ascocarps

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