Compounds of 城

• 金城鉄壁
  (n) impregnable castle (walls)
  redoubtable
• 金城湯池
  (n) an impregnable fortress
  an unassailable territory
• 傾国傾城
  (n) woman so glamorous as to bring ruin to a country (castle) as its king (lord) is captivated by her beauty
  femme fatale
• 傾城傾国
  (n) woman so glamorous as to bring ruin to a country (castle) as its king (lord) is captivated by her beauty
  femme fatale
• 孤城落日
  (n) feeling (looking) lone and helpless
  helplessness of those in reduced circumstances
• 弧城落月
  (n) feeling apprehensive
  feeling (looking) lone and helpless
  being down-and-out (ruined)
  helplessness of those in reduced circumstances
• 城を取る
  (exp) to take a castle
• 城を襲う
  (exp) to raid a fort
• 城郭都市
  (n) fortified city
  walled city
• 籠城作戦
  (n) strategy of holing oneself up in a castle (house, building)
• 城を陥れる
  (exp) to carry a castle
• 万里の長城
  (n) Great Wall of China
• 万里の長城
  (n) Great Wall of China
• 一国一城の主
  (n) feudal lord
  head of a household
  proudly independent person
• 口では大阪の城も建つ
  (exp) easier said than done
  lit: if it's just talking you can even build Osaka Castle