茨城県[ibarakiken] Ibaraki prefecture (Kantou area)
王城[oujou] royal castle
下城[gejou] withdrawing from the castle
牙城[gajou] stronghold (esp. of an enemy or opponent)
開城[kaijou] capitulation (of fort)

宮城[kyuujou] Imperial Palace
宮城県[miyagiken] Miyagi prefecture (Tohoku area)
傾城[keisei] beauty
堅城[kenjou] strong fortress
古城[kojou] old castle

陥る[ochiiru] to fall
陥れる[otoshiireru] to trick someone into (committing a crime, etc.)
陥没[kanbotsu] cave-in
陥落[kanraku] fall
陥せい[kansei] trap

欠陥[kekkan] defect
自縄自縛に陥る[jijoujibakuniochiiru] to be caught in one's own trap
失陥[shikkan] surrender
陥入[kannyuu] subsiding
陥没湖[kanbotsuko] lake formed in volcanic caldera