Word

夜空

よぞら
night sky
Word

滑空

かっくう
gliding (through the air)
Word

空席

くうせき
vacancy; vacant seat; room
Word

中空

ちゅうくう、なかぞら
hollow; emptiness; mid-air; the air
Word

空ける

虚ける
v1
vi
うつける
to become empty (hollow); to relax from a tense situation into a vacant or absent minded state
Word

開ける

空ける、明ける
v1
vt
vi
あける
to open (a door, etc.); to unwrap (e.g. parcel, package); to unlock; to open (for business, etc.); to empty; to remove; to make space; to make room; to move out; to clear out; to be away from (e.g. one's house); to leave (temporarily); to dawn; to grow light; to end (of a period, season); to begin (of the New Year); to leave (one's schedule) open; to make time (for); to make (a hole); to open up (a hole)
Word

空振り

からぶり
striking (at something) and missing; in vain
Word

低空

ていくう
low altitude; low sky
Word

空車

空き車
くうしゃ、からぐるま、あきぐるま
empty conveyance; free taxi; parking lot with spaces available
Word

空腹

くうふく
hunger