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

山砦[sansai] mountain stronghold
城砦[jousai] fortress
砦を落とす[toridewootosu] to capture a fort

砦を築く[toridewokizuku] to construct a fort
鹿砦[rokusai] abatis