Denshi Jisho — Online Japanese dictionary

公益 こうえき public; public good
Common word, Noun, No-adjective 
校閲 こうえつ revision; proofreading
Common word, Noun, Suru verb 
公園 こうえん (public) park
Common word, Noun 
公演 こうえん 1: public performance;
2: sumo exhibition in a foreign country
Common word, Noun, Suru verb 
後援 こうえん support; backing
Common word, Noun, Suru verb 
講演 こうえん lecture; address; speech
Common word, Noun, Suru verb 
甲乙 こうおつ 1: A and B; excellent and good; similarity;
2: discrimination; discernment; distinction;
3: first and second parties (in legal contexts)
Common word, Noun 
高温 こうおん high temperature
Common word, Noun 
高音 こうおん high-pitched tone; soprano
Common word, Noun 
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 

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