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

肛門[koumon] anus
脱肛[dakkou] anal prolapse
肛門学[koumongaku] proctology
肛門科[koumonka] proctology clinic
肛門出血[koumonshukketsu] anal bleeding

肛門上皮[koumonjouhi] anal epithelium
肛門期[koumonki] anal stage
内肛動物[naikoudoubutsu] entoproct (any animal of phylum Entoprocta)
外肛動物[gaikoudoubutsu] Bryozoa animal
肛門性交[koumonseikou] anal intercourse

一門[ichimon] family
陰門[inmon] (female) genitalia
開門[kaimon] opening gate
凱旋門[gaisenmon] arch of triumph
冠木門[kabukimon] gate with a crossbar

関門[kanmon] barrier
玉門[gyokumon] beautifully decorated gate (euph. for female genitalia)
桑門[soumon] monk
軍門[gunmon] camp gate