JLPT1 G7 S5 F1844
尸 body + an abbreviated form# of 比 line up → close contact among members of a group of similar people (compare 二). *Nun* is a borrowed meaning, to transliterate the Sanskrit bhiksuni (nun) (比丘尼). Note that あま is thought to be a Japanese transliteration of the Pali term for "mother".
[Full Kanji Etymology List]