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

右小括弧[migishoukakko] closing parenthesis
右中括弧[migichuukakko] closing brace
円弧[enko] arc
括弧[kakko] parentheses
丸括弧[marugakko] parentheses

弧城[kojou] solitary castle
弧を描く[kowoegaku] to draw an arc (e.g. with a compass)
弧光[kokou] arc light
弧状[kojou] in form of arch
弧線[kosen] arc (of a circle)