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

印池[inchi] seal stamp pad
乾電池[kandenchi] dry cell
古池[furuike] old pool
光電池[koudenchi] photocell
湿電池[shitsudenchi] wet cell battery

酒池肉林[shuchinikurin] sumptuous feast
人工池[jinkouike] artificial pool
蓄電池[chikudenchi] storage battery
貯水池[chosuichi] reservoir