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