Denshi Jisho — Online Japanese dictionary

廓 くるわ 1: district; quarter;
2: enclosure; area enclosed by earthwork;
3: red-light district
Noun 
郭 くるわ 1: district; quarter;
2: enclosure; area enclosed by earthwork;
3: red-light district
Noun 
枢 くろろ 1: pivot hinge (using extensions on the top & bottom of a door that fit into cavities in the frame);
2: sliding wooden bolt (for holding a door or window shut)
Noun 
区域 くいき 1: limits; boundary; domain; zone; sphere; territory;
2: area (e.g. in programming languages)
Common word, Noun 
空気 くうき air; atmosphere
Common word, Noun 
空疎 くうそ vain; groundless; futile
Common word, Na-adjective, Noun 
空母 くうぼ aircraft carrier
Common word, Noun, Abbreviation 
空輸 くうゆ air transport
Common word, Noun, Suru verb, No-adjective 
空路 くうろ air lane
Common word, Adverbial noun, Temporal noun 
区画 くかく division; section; compartment; boundary; area; block
Common word, Noun, Suru verb 
区間 くかん 1: section (of track, etc.); segment; dimension;
2: (Mathematical term) interval
Common word, Noun, Noun suffix 
九月 くがつ September
Common word, Adverbial noun 
９月 くがつ September
Common word, Adverbial noun 
括る くくる 1: to tie up; to tie together; to bind; to bundle; to fasten;
2: to hang (oneself);
3: to summarize; to put (it all) together; to consolidate;
4: to estimate; to expect;
5: to tie-dye;
6: (Archaism) to detain; to check; to restrain
Common word, Godan verb with ru ending, Transitive verb 
潜る くぐる 1: (Usually written using kana alone) to drive; to pass through; to pass under;
2: to evade; to hide;
3: to survive
Common word, Godan verb with ru ending, Intransitive verb 
苦言 くげん candid (frank) advice; exhortation
Common word, Noun, No-adjective 
臭い くさい 1: stinking; smelly;
2: suspicious; fishy;
3: clumsy
Common word, Adjective 
草木 くさき plants; vegetation
Common word, Noun 
腐る くさる 1: to rot; to go bad; to decay; to spoil; to fester; to decompose; to turn sour (e.g. milk);
2: to corrode; to weather; to crumble;
3: to become useless; to blunt; to weaken (from lack of practice);
4: to become depraved; to be degenerate; to be morally bankrupt; to be corrupt;
5: to be depressed; to be dispirited; to feel discouraged; to feel down;
6: ()
7: (Usually written using kana alone) (Kansai dialect) indicates scorn or disdain for another's action; () (Archaism) to lose a bet;
8: (Archaism) to be drenched; to become sopping wet
Common word, Godan verb with ru ending, Intransitive verb 
苦心 くしん pain; trouble; anxiety; diligence; hard work
Common word, Noun, Suru verb 
駆除 くじょ extermination; expulsion; destruction
Common word, Noun, Suru verb 
崩す くずす to destroy; to pull down; to make change (money)
Common word, Godan verb with su ending, Transitive verb 
崩れ くずれ crumbling; collapse; ruin
Common word, Noun 
癖に くせに and yet; though; when; in spite of
Common word, Conjunction, Particle, Usually written using kana alone 
苦戦 くせん hard fight; close game
Common word, Noun, Suru verb 
砕く くだく to break; to smash
Common word, Godan verb with ku ending, Transitive verb 

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