Compounds of 開

• 言開き
  (n) explanation
  justification
  vindication
• 言開く
  (v5k,vt) to justify
  to explain
  to vindicate
• 御開き
  (n) breakup (of a ceremony, wedding, party, meeting, etc.)
  closure
• 公開鍵
  (n) (comp) public key
• 公開状
  (n) open letter
• 公開文
  (n) (comp) public text
• 口開け
  (n) opening
  broaching
  beginning
  first sale
• 再開発
  (n,vs) redevelopment
  (P)
• 山開き
  (n) start of the mountain-climbing season
• 序開き
  (n,vs) beginnings
  origins
• 小開ひ
  (n) (obsc) opening a door for a moment (esp. on the train, when someone's foot is stuck, etc.)
• 小開扉
  (n) (obsc) opening a door for a moment (esp. on the train, when someone's foot is stuck, etc.)
• 伸開線
  (n) (math) (obsc) involute
• 新開地
  (n) newly opened or recently settled land
• 新開発
  (n) new development
  new discovery
• 切開く
  (v5k,vt) to clear (land)
  to open up
  to cut through
• 川開き
  (n) festival marking the start of boating season
• 前開き
  (n) open in front
• 疎開者
  (n) evacuee
• 蔵開き
  (n,vs) first opening of warehouse after New Year
• 打開策
  (n) plan to overcome an obstacle or break out of a deadlock
  breakthrough solution
• 展開図
  (n) (math) development
  development view
• 店開き
  (n,vs) opening a store
  starting a business
  (P)
• 投開票
  (n) general election
  public ballot
• 内開き
  (n) opening inward (e.g. door, window)
• 背開き
  (n) slicing a fish down its back
• 半開き
  (n) partly open
  in half bloom
• 半開国
  (n) underdeveloped country
  half-civilized country
  half-civilised country
• 非公開
  (adj-no,n) private
  (P)
• 片開き
  (n) single door (as opposed to a double door)