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

インフラ開発[infurakaihatsu] infrastructure development
エンジン発動機[enjinhatsudouki] engine
バス発着場[basuhacchakujou] depot
発条[bane] spring (e.g. coil, leaf)
ロケット発射筒[rokettohasshatou] rocket launcher

異常発生[ijouhassei] plague
一触即発[isshokusokuhatsu] critical (touch and go) situation
一念発起[ichinenhokki] being resolved to (do something)
一発[ippatsu] one shot
一発かます[ippatsukamasu] to hit someone

愛育[aiiku] tender nurture
安全教育[anzenkyouiku] safety education
育ち[sodachi] breeding
育ちゆく[sodachiyuku] to grow up
育つ[sodatsu] to be raised (e.g. child)

育て[sodate] bringing up
育ての親[sodatenooya] foster parents
育てる[sodateru] to raise
育てあげる[sodateageru] to raise (to maturity)
育て親[sodateoya] foster parent