Denshi Jisho — Online Japanese dictionary

オカリナ ocarina (type of flute)
Common word, Noun, ita: 
オカルト occult
Common word, Na-adjective, No-adjective 
おしっこ 1:
2: (Colloquialism) wee-wee; pee-pee; number one; (Suru verb) to urinate
Common word, Noun 
オスカー Oscar
Common word, Noun 
おっさん 1: (Abbreviation) rude term for middle-aged man;
2: Buddhist priest
Common word, Noun 
おっぱい 1: (Children''s langauge) breasts; boobies; tits;
2: (Children''s langauge) breast milk
Common word, Noun 
おどおど coweringly; hesitantly
Common word, Adverb, Noun, Suru verb, Onomatopoeic or mimetic word 
オニオン onion (edible plant, Allium cepa)
Common word, Noun 
オハイオ Ohio
Common word, Noun 
オフィス office
Common word, Noun 
オフレコ off-the-record
Common word, Noun, No-adjective 
オブジェ objet d'art; item of artwork
Common word, Noun, fre: 
オムレツ omelette; omelet
Common word, Noun 
オムロン Omron Corporation (Japanese electronics firm)
Common word, Noun 
オラクル oracle
Common word, Noun 
オリオン Orion
Common word, Noun 
オルガン organ (musical instrument) (por: orgao)
Common word, Noun 
オレンジ orange
Common word, Noun 
おろおろ nervous; flustered; in a dither; all shook up
Common word, Adverb, Adverb taking the 'to' particle, Suru verb, Onomatopoeic or mimetic word 
オンエア on air; on the air
Common word, Noun, Suru verb 
オンリー only
Common word, Noun 
オーエー OA; office automation
Common word, Noun, Computer terminology, Abbreviation 
オークス oaks
Common word, Noun 
オーダー order
Common word, Noun, Suru verb 
オーナー owner
Common word, Noun 
オーバー 1: (Abbreviation) overcoat;
2: over; exceeding; going beyond; exaggeration;
3: ball hit over the head of an outfielder (baseball)
Common word, Na-adjective, Noun, Suru verb 

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