Denshi Jisho — Online Japanese dictionary

お oh! (expression of slight surprise)
Interjection 
尾 お 1: tail (animal, kite, comet, etc.); tail end;
2: slope at the foot of a mountain
Common word, Noun 
御 お honourable; honorable
Common word, Prefix, Usually written using kana alone 
緒 お cord; strap; thong
Common word, Noun 
小 お 1: small; narrow;
2: familiar prefix;
3: slightly; a bit
Prefix 
苧 お 1: cannabis (Cannabis sativa); hemp (plant);
2: hemp (fiber); linen; flax; jute
Out-dated or obsolete kana, Noun 
諾 お yes; all right; OK; okay
Interjection, Archaism 
麻 お 1: cannabis (Cannabis sativa); hemp (plant);
2: hemp (fiber); linen; flax; jute
Out-dated or obsolete kana, Noun 
小 こ 1: small; little; slight;
2: slightly less than; just about;
3: somewhat; somehow;
4: minor (sometimes derogatory); petty
Prefix 
オケ orchestra
Common word, Noun, Abbreviation 
オフ off
Common word, Noun 
オペ medical operation
Common word, Noun, Abbreviation 
おや oh!; oh?; my!
Common word, Conjunction, Interjection, Noun 
オン on
Common word, Noun, Suru verb 
オア OR
Noun, Computer terminology 
おい 1: hey!; oi!;
2: (Kansai dialect) me
Interjection 
オグ ogg (file container format)
Noun, Computer terminology 
オス male (animal)
Noun, No-adjective 
オタ nerd; geek; enthusiast
Noun, Suffix, Colloquialism, Abbreviation 
おは Good morning!; Hi!
Interjection, Abbreviation 
おみ 1: (Abbreviation) (Colloquialism) miso (usu. said by housewives);
2: miso soup
Noun 
おん (Okinawa) sacred site; sacred grove
Noun 
甥 おい nephew
Common word, Noun 
王 おう 1: king; ruler; sovereign; monarch;
2: king (for senior player) (shogi)
Common word, Noun, Noun suffix 
翁 おう old man; venerable
Common word, Noun 
丘 おか hill; height; knoll; rising ground
Common word, Noun 

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