Denshi Jisho — Online Japanese dictionary

空域 くういき airspace
Common word, Noun 
空間 くうかん space; room; airspace
Common word, Noun 
空虚 くうきょ emptiness; vacancy
Common word, Na-adjective, Noun 
空軍 くうぐん Air Force
Common word, Noun, No-adjective 
空港 くうこう airport
Common word, Noun 
空車 くうしゃ 1: empty conveyance; free taxi;
2: parking lot with spaces available
Common word, Noun 
空席 くうせき vacancy; vacant seat; room
Common word, Noun, No-adjective 
空前 くうぜん unprecedented; record-breaking
Common word, Noun, No-adjective 
空想 くうそう daydream; fantasy; fancy; vision
Common word, Noun, Suru verb, No-adjective 
空転 くうてん 1: racing (an engine); idling (an engine);
2: arguing in circles with no result
Common word, Noun, Suru verb 
空洞 くうどう cave; hollow; cavity
Common word, Noun 
空白 くうはく blank space; vacuum; space; null (NUL)
Common word, Na-adjective, Noun, No-adjective 
空爆 くうばく aerial bombing
Common word, Noun, Suru verb, No-adjective 
空腹 くうふく hunger
Common word, Na-adjective, Noun, No-adjective 
空砲 くうほう empty gun; gun loaded with blanks; firing a blank
Common word, Noun 
空欄 くうらん blank space
Common word, Noun 
苦境 くきょう trouble; crisis; predicament; squeeze; pinch
Common word, Noun 
草花 くさばな flower; flowering plant
Common word, Noun 
句集 くしゅう collection of haiku poems
Common word, Noun 
苦笑 くしょう bitter smile; wry smile; strained laugh; sarcastic laugh
Common word, Noun, Suru verb 
籤引 くじびき lottery; drawn lot
Common word, Noun, Suru verb, Usually written using kana alone 
苦渋 くじゅう bitterness; mortification; difficulty in understanding; distress; affliction
Common word, Noun, Suru verb, No-adjective 
苦情 くじょう complaint; troubles; objection; grievance
Common word, Noun 
擽る くすぐる 1: (Usually written using kana alone) to tickle;
2: (Usually written using kana alone) to tickle (one's fancy); to appeal; to flatter; to titillate;
3: (Usually written using kana alone) to amuse; to entertain
Common word, Godan verb with ru ending, Transitive verb 
果物 くだもの fruit
Common word, Noun 
口数 くちかず 1: number of words a person speaks;
2: number of dependents (words, shares, accounts)
Common word, Noun 

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