御中[onaka] stomach
御話中[ohanashichuu] busy (phone)
アル中[aruchuu] alcoholism
π中間子[paichuukanshi] pi meson
暗中[anchuu] in the dark

暗中摸索[anchuumosaku] groping in the dark
意中[ichuu] one's mind
意中の女[ichuunoonna] sweetheart
井の中の蛙大海を知らず[inonakanokawazutaikaiwoshirazu] parochial
一日中[ichinichijuu] all day long

共産党中央委員会[kyousantouchuuouiinkai] Central Committee of the Communist Party
震央[shinou] epicentre (of an earthquake)
中央[chuuou] centre
中央アジア[chuuouajia] central Asia
中央委員会[chuuouiinkai] central committee

中央計画[chuuoukeikaku] centralized planning
中央口[chuuouguchi] central entrance
中央集権[chuuoushuuken] centralized authoritarian rule
中央集権化[chuuoushuukenka] centralization of power
中央処理装置[chuuoushorisouchi] central processing unit

沖縄開発庁長官[okinawakaihatsuchouchoukan] Director General of Okinawa Development Agency
科学技術庁[kagakugijutsuchou] Science and Technology Agency
科学技術庁長官[kagakugijutsuchouchoukan] Director General of Science and Technology Agency
官公庁[kankouchou] government administration office
官庁[kanchou] government office

官庁街[kanchougai] government district
環境庁[kankyouchou] Environment Agency
環境庁長官[kankyouchouchoukan] Director General of Environment Agency
管轄官庁[kankatsukanchou] controlling office
気象庁[kishouchou] (Japanese) Meteorological Agency

運輸省[unyushou] Ministry of Transport
外務省[gaimushou] Ministry of Foreign Affairs
各省[kakushou] each ministry
冠省[kanshou] Forgive me for dispensing with the preliminaries, but I hasten to inform you that...
帰省[kisei] homecoming

教育省[kyouikushou] Department of Education
省みる[kaerimiru] to look back (e.g. over shoulder or at the past)
厚生省[kouseishou] Ministry of Health and Welfare (now Ministry of Health, Labour and Welfare)
国防総省[kokubousoushou] National Military Establishment
国務省[kokumushou] State Department