Denshi Jisho — Online Japanese dictionary

コシダ old world forked fern; Dicranopteris linearis
Noun, Usually written using kana alone 
コジイ Castanopsis cuspidata (species of chinquapin)
Noun, Usually written using kana alone 
コスパ cost performance
Noun, Abbreviation 
コスメ cosmetics
Noun, Abbreviation 
コスる to cosplay; to dress up in costume (of some anime character, etc.)
Godan verb with ru ending, Slang 
コタツ kotatsu; table over an electric heater (orig. a charcoal brazier in a floor well) with a hanging quilt that retains heat
Noun, Usually written using kana alone 
こだま regular (stops at every station) Toukai-line Shinkansen
Noun 
こった slang form of "koto da"
Expression, Colloquialism 
コツメ otter
Noun, Abbreviation 
ことん clunk; thump
Adverb taking the 'to' particle, Onomatopoeic or mimetic word 
コドン codon
Noun 
コナラ konara oak; quercus serrata
Noun 
コハダ mid-sized konoshiro gizzard shad (i.e. about 15 cm in size)
Noun, Usually written using kana alone 
コパル copal
Noun 
こぴぺ copy-and-paste
Noun, Suru verb, Abbreviation 
コピペ copy-and-paste
Noun, Suru verb, Abbreviation 
コピる to copy
Godan verb with ru ending 
コプト Copt
Noun 
コプラ 1: copra;
2: (Linguistic term) copula
Noun 
コプロ coprocessor
Noun, Computer terminology 
コペラ splashing goby (Copella spp.) (lat: Copella); splash goby
Noun 
コボル Common Business Oriented Language; COBOL
Noun, Computer terminology 
コマイ (Usually written using kana alone) saffron cod (Eleginus gracilis)
Noun 
こます 1: to do; to have sexual intercourse;
2: to give; to present; to award
Godan verb with su ending, Intransitive verb 
コミケ comic (book) market
Noun, Abbreviation 
コミュ community
Noun, Computer terminology, Abbreviation 

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