安全期[anzenki] safe period
暗黒期[ankokuki] eclipse period
一期[ichigo] one's life time
一期[ikki] one term
一期一会[ichigoichie] once-in-a-lifetime encounter (hence should be cherished as such)

一周期[isshuuki] period (in astronomy)
一定期間[itteikikan] fixed interval
延期[enki] postponement
延期になる[enkininaru] to be postponed
沖積期[chuusekiki] alluvial period

延納[ennou] deferred payment
仮納[kanou] deposit
仮納金[kanoukin] deposit
仮納税[karinouzei] tax payment under protest
格納[kakunou] storage

格納庫[kakunouko] (aircraft) hangar
帰納[kinou] induction
帰納法[kinouhou] induction
結納[yuinou] engagement gift
献納[kennou] offering