懐旧[kaikyuu] recalling the old days
旧ソ連[kyuusoren] former Soviet Union
旧悪[kyuuaku] past misdeeds
旧衣[kyuui] worn-out clothes
旧詠[kyuuei] ancient poems

旧怨[kyuuen] old grudge
旧縁[kyuuen] old relationship
旧恩[kyuuon] old favors
旧仮名遣[kyuukanazukai] former (i.e. before the post-WWII reforms) kana usage in writing the readings of kanji

遺臣[ishin] surviving retainer
一夜大臣[ichiyadaijin] overnight millionaire
右大臣[udaijin] Minister of the Right (official in Nara and Heian periods)
運輸大臣[unyudaijin] Minister of Transport
下臣[kashin] low-rank retainer

家臣[kashin] vassal
外務大臣[gaimudaijin] Minister for Foreign Affairs
旧臣[kyuushin] old retainer
君臣[kunshin] ruler and ruled
建設大臣[kensetsudaijin] Minister of Construction