Denshi Jisho — Online Japanese dictionary

公海 こうかい high seas; international waters
Common word, Noun 
公開 こうかい open to the public; exhibit
Common word, Noun, Suru verb, No-adjective 
後悔 こうかい regret; repentance
Common word, Noun, Suru verb, No-adjective 
更改 こうかい renewal; extension; revision
Common word, Noun, Suru verb 
航海 こうかい sail; voyage
Common word, Noun, Suru verb, No-adjective 
降格 こうかく demotion
Common word, Noun, Suru verb 
交換 こうかん exchange; interchange; switching; reciprocity; barter; substitution; replacement; clearing (of checks, cheques)
Common word, Noun, Suru verb 
公館 こうかん official residence
Common word, Noun 
好感 こうかん good feeling; good will; favourable impression; favorable impression
Common word, Noun 
高官 こうかん high official
Common word, Noun, No-adjective 
公害 こうがい pollution; public nuisance; contamination
Common word, Noun, No-adjective 
郊外 こうがい suburb; outskirts
Common word, Noun, No-adjective 
光学 こうがく optics
Common word, Noun, No-adjective 
工学 こうがく engineering
Common word, Noun 
高額 こうがく large sum (money)
Common word, Na-adjective, Noun, No-adjective 
皇居 こうきょ Imperial Palace
Common word, Noun 
公金 こうきん public funds
Common word, Noun 
抗菌 こうきん antibacterial; antimicrobial
Common word, Na-adjective, Noun, No-adjective 
拘禁 こうきん intern
Common word, Noun, Suru verb 
航空 こうくう aviation; flying
Common word, Noun, No-adjective 
光景 こうけい scene; spectacle; sight; view
Common word, Noun 
口径 こうけい aperture; bore; calibre; caliber
Common word, Noun 
後継 こうけい 1: succession;
2: (Noun) successor
Common word, Noun, Noun or verb acting prenominally 
高潔 こうけつ purity; nobility
Common word, Na-adjective, Noun 
後見 こうけん 1: guardianship; guardian;
2: (theatrical) assistant; prompter
Common word, Noun, Suru verb 

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