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Most common first
Japanese order (あいうえお)
Romaji (A–Z)
JLPT level (easy → hard)
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Word family of 空
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空気
くうき
Common word
N4
Nouns
air; atmosphere · mood; atmosphere; situation · someone with no presence; someone who doesn't stand out
空間
くうかん
Common word
N2
Nouns
space; room; airspace
空港
くうこう
Common word
N5
Nouns
airport
航空
こうくう
Common word
N3
Nouns
aviation; flying
空中
くうちゅう
Common word
N2
Nouns
in the air; midair; sky
空母
くうぼ
Common word
Nouns
aircraft carrier
上空
じょうくう
Common word
N1
Nouns
sky; the skies; upper air
空軍
くうぐん
Common word
N1
Nouns
air force
架空
かくう
Common word
N2
Other
fictitious; imaginary; fabricated · aerial; overhead
空腹
くうふく
Common word
N1
Nouns
empty stomach; hunger
時空
じくう
Nouns
spacetime; space-time
真空
しんくう
Common word
N2
Nouns
vacuum · absolute void; complete vacuity
天空
てんくう
Nouns
sky; heavens; firmament
空想
くうそう
Common word
N2
Nouns
daydream; fantasy; fancy; vision
空白
くうはく
Common word
N1
Nouns
blank space; blank area · blank; void; gap; vacuum · whitespace
空襲
くうしゅう
Common word
Nouns
air raid; aerial attack
空爆
くうばく
Common word
Nouns
aerial bombing; air raid
空調
くうちょう
Common word
Nouns
air conditioning
対空
たいくう
Other
anti-aircraft
孫悟空
そんごくう
Nouns
Sun Wukong; Monkey King · Son Goku
空席
くうせき
Common word
N2
Nouns
empty seat; unoccupied seat · vacancy; vacant post; unfilled position
空洞
くうどう
Common word
Nouns
cavity; hollow; cavern · hollow; cavernous
空虚
くうきょ
Common word
N1
Nouns
emptiness; hollowness; void · inanity; pointlessness; meaninglessness
防空
ぼうくう
Common word
Nouns
air defense
低空
ていくう
Nouns
low altitude; low sky
空前
くうぜん
Common word
Other
unprecedented; record-breaking
空冷
くうれい
Nouns
air cooling
領空
りょうくう
Common word
N1
Nouns
territorial airspace
空挺
くうてい
Other
airborne
空域
くういき
Common word
Nouns
airspace
中空
ちゅうくう
Other
hollow · mid-air; in the air; sky
空欄
くうらん
Common word
Nouns
blank space; blank column; empty field
空輸
くうゆ
Common word
Nouns
air transport; airlift
空戦
くうせん
Nouns
air battle; dogfight
空力
くうりき
Nouns
aerodynamics
虚空
こくう
Common word
Nouns
empty space; void; empty sky
滑空
かっくう
Nouns
gliding; soaring
空砲
くうほう
Common word
Nouns
blank ammunition; blank cartridge; firing a blank
空論
くうろん
Nouns
abstract theory; impractical theory; empty theory
陸海空
りくかいくう
Nouns
land, sea and air · army, navy and air force
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