Compounds of 空

• 空
  (n) hollow
  cavity
  hole
• 空
  (n,adj-no) emptiness
  vacuum
  blank
  (P)
• 空
  (n) (1) empty air
  sky
  (2) (Buddh) shunya (emptiness, the lack of an immutable intrinsic nature within any phemomenon)
  (3) (abbr) air force
  (n,adj-na) (4) fruitlessness
  meaninglessness
• 空
  (n) sky
  the heavens
  (P)
• 雨空
  (n) threatening sky
• 架空
  (adj-na,n,adj-no) aerial
  overhead
  fiction
  fanciful
  (P)
• 滑空
  (n,vs) gliding in a glider
• 寒空
  (n) cold weather
• 虚空
  (n) empty space
  empty sky
  (P)
• 空々
  (adj-na,n) empty
  vacant
  void
• 空き
  (n) (1) space
  room
  emptiness
  gap
  (2) opening
  vacancy
  empty seat
  (3) free time
  time to spare
  (4) disuse
  unused thing
  (P)
• 空く
  (v5k,vi) (1) to open (e.g. doors)
  (2) to open (e.g. business, etc.)
  (3) to be empty
  (4) to be vacant
  to be available
  to be free
  (5) to be open (e.g. neckline, etc.)
  (6) to have been opened (of one's eyes, mouth, etc.)
  (7) to come to an end
  (v5k,vt) (8) to open (one's eyes, mouth, etc.)
  (v5k,vi) (9) to have a hole
  to form a gap
  to have an interval (between events)
  (P)
• 空く
  (v5k,vi) (1) to become less crowded
  to thin out
  to get empty
  (2) to be hungry
  (P)
• 空で
  (exp) (1) off the top of one's head
  from thin air
  (2) from memory
• 空ろ
  (adj-na,n) blank
  cavity
  hollow
  empty (space)
• 空圧
  (n) air pressure
  pneumatic pressure
• 空位
  (n) vacant post
  post in name only
• 空尉
  (n) (Self Defense Force's Air Force) captain (defence)
  lieutenant
• 空域
  (n) airspace
  (P)
• 空引
  (n) (1) (arch) type of loom used in olden times
  (2) loom
  traditional loom
• 空桶
  (n) pun on karaoke (empty bucket)
• 空音
  (n) imitated cry (of an animal)
  lie
• 空家
  (n) vacant house
  unoccupied house
• 空荷
  (n,adj-no) lacking cargo
  in ballast
• 空咳
  (n) dry cough
  hacking cough
• 空咳
  (n) dry cough
  hacking cough
• 空株
  (n) fictitious stock
• 空株
  (n) fictitious stock
• 空間
  (n,adj-no) vacancy
  room for rent or lease
• 空間
  (n) space
  room
  airspace
  (P)