Compounds of 急

• 急性
  (n,adj-no) acute (e.g. illness)
  (P)
• 急逝
  (n,vs) sudden death
  (P)
• 急切
  (n) under pressure
  urgency
• 急設
  (n,vs) hurried construction
  speedy laying
• 急送
  (n,vs) dispatch
  despatch
• 急増
  (n,vs) explosion
  proliferation
  surge
  (P)
• 急造
  (n,vs,adj-no) hurried construction
• 急速
  (adj-na,n) rapid (e.g. progress)
  (P)
• 急追
  (n,vs) (being in) hot pursuit
• 急転
  (n,vs) sudden change
• 急度
  (adv,n) (1) (uk) surely
  undoubtedly
  almost certainly
  most likely (e.g. 90 percent)
  (2) (arch) sternly
  severely
• 急騰
  (n,vs) sudden rise
  jump
  sharp rise
  (P)
• 急難
  (n) sudden or unexpected disaster
• 急派
  (n,vs) dispatch
  despatch
• 急迫
  (n,vs) urgency
  imminence
• 急病
  (n) sudden illness
  (P)
• 急変
  (n,vs) (1) sudden turn
  sudden change
  (2) (suddenly occurring) accident
  emergency
  (P)
• 急募
  (n,vs) urgent recruit
• 急報
  (n,vs) urgent report or message
• 急務
  (n) urgent business
  (P)
• 急用
  (n) urgent business
  (P)
• 急落
  (n,vs) sudden fall
  sharp fall
  sudden drop
  sharp drop
  (P)
• 急流
  (n,adj-no) swift current
  rapids
• 急冷
  (n,vs) rapid cooling
• 急遽
  (adj-na,adv) hurriedly
  in a hurry
  (P)
• 救急
  (n,adj-no) first-aid
  emergency (aid)
  (P)
• 緊急
  (adj-na,n,adj-no) urgent
  pressing
  emergency
  (P)
• 警急
  (n,n-pref) alarm
  emergency
  sudden contingency
  alert
• 至急
  (adv,n,adj-no) urgent
  pressing
  (P)
• 準急
  (n) semi-express train (slower than an express)
  local express train
  (P)