Word

陸海空

りくかいくう
land, sea, and air
Word

空路

くうろ
air lane
Word

空転

くうてん
racing (an engine); idling (an engine); going in circles (esp. argument, discussion, etc.); spinning one's wheels
Word

領空

りょうくう
territorial airspace
Word

制空権

せいくうけん
air superiority; mastery of the air
Word

空回り

からまわり
racing (of an engine); spinning one's wheels; fruitless effort
Word

空しい

虚しい
むなしい
empty; void; vacant; vain; fruitless; futile; ineffective; lifeless
Word

空蝉

虚蝉、現人
うつせみ、うつそみ、うつしおみ
man of this world; the real world; temporal things; cast-off cicada shell; cicada
Word

空砲

くうほう
empty gun; gun loaded with blanks; firing a blank
Word

空耳

そら耳
そらみみ
mishearing; (feigned) deafness; homophonic translation of song lyrics for comic effect