Denshi Jisho — Online Japanese dictionary

オオモズ northern shrike; great grey shrike (Lanius excubitor)
Noun, Usually written using kana alone 
オオルリ blue-and-white flycatcher (Cyanoptila cyanomelana)
Noun, Usually written using kana alone 
おかしみ humor; humour; wit
Noun 
おかちん mochi
Noun, Female term or language, Archaism 
オキアミ krill; euphasiid (any species in the family Euphausiacea)
Noun, Usually written using kana alone 
おきえそ bluntnose lizardfish (Trachinocephalus myops); snakefish
Noun, Usually written using kana alone 
オキエソ bluntnose lizardfish (Trachinocephalus myops); snakefish
Noun, Usually written using kana alone 
オキニシ warty frog shell (Bursa bufonia dunkeri)
Noun, Usually written using kana alone 
おぎゃあ cry (of baby); mewl (of kitten)
Noun 
オギョウ Jersey cudweed (species of cottonweed, Gnaphalium affine)
Noun, Usually written using kana alone 
オクタボ octavo
Noun 
オクタン octane
Noun 
おこじょ stoat; ermine; short-tailed weasel (Mustela erminea)
Noun 
オコジョ stoat; ermine; short-tailed weasel (Mustela erminea)
Noun 
オゴポゴ Ogopogo (lake monster reported to live in Canada's Lake Okanagan)
Noun 
オサガメ leatherback turtle (Dermochelys coriacea)
Noun, Usually written using kana alone 
おさらば good-bye; farewell
Noun, Suru verb 
オシザメ false catshark (species of deep water ground shark, Pseudotriakis microdon)
Noun 
おしゃま precocity
Noun, Na-adjective 
オシャレ 1:
2: (Usually written using kana alone) smartly dressed; stylish; fashion-conscious; (Noun) someone smartly dressed;
3: (Suru verb) to dress up; to be fashionable
Na-adjective, No-adjective 
オジサン 1: (Honorific or respectful language) (Familiar language) uncle;
2: (Familiar language) old man; mister (vocative);
3: (Usually written using kana alone) manybar goatfish (Parupeneus multifasciatus)
Noun 
おじゃる 1:
2: (Archaism) (Honorific or respectful language) to come; to go; to be; (Auxiliary verb) (usu. after the particle 'de') forms a polite copula
Yondan verb with ru ending (archaic) 
おじゃん coming to nothing
Noun 
オスネジ male screw
Noun 
オスパー ocean space explorer; OSPER
Noun 
おせんち sentimental; sentimentality
Noun, Na-adjective, Usually written using kana alone, Colloquialism, Abbreviation 

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