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

改築[kaichiku] structural alteration of building
建築[kenchiku] construction
建築家[kenchikuka] architect
構築[kouchiku] construction
再建築[saikenchiku] reconstruction

再構築[saikouchiku] reconstruction
修築[shuuchiku] repair
上層建築[jousoukenchiku] superstructure
新築[shinchiku] new building
増築[zouchiku] addition to a building