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

熟々[tsukuzuku] completely
円熟[enjuku] ripeness
黄熟[koujuku] ripening and turning yellow
噛熟す[kamikonasu] to chew
完熟[kanjuku] completely ripe or mature

使い熟す[tsukaikonasu] to handle (men)
四字熟語[yojijukugo] four-character idiomatic compounds
修熟[shuujuku] developing skill
習熟[shuujuku] skilled
熟す[jukusu] to ripen

絢爛[kenran] gorgeous
粲爛[sanran] brilliant
天真爛漫[tenshinranman] naivete
爛らかす[tadarakasu] to cause to be inflamed
爛れる[tadareru] to be sore

爛死[ranshi] burning to death
爛熟[ranjuku] overripeness
爛熳[ranman] glorious
糜爛[biran] inflammation
糜爛性[biransei] irritating