御構いなく[okamainaku] please don't fuss over me
サーボ機構[saabokikou] servomechanism
シフト演算機構[shifutoenzankikou] shift arithmetic unit
ヒグス機構[higusukikou] Higgs mechanism (physics)
遺構[ikou] remains

一向に構わない[ikkounikamawanai] doesn't care at all
一般命令演算機構[ippanmeireienzankikou] general instruction unit (computer)
機構[kikou] mechanism
気構え[kigamae] readiness
虚構[kyokou] fiction

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