陰核[inkaku] clitoris
核エネルギー[kakuenerugii] nuclear energy
核家族[kakukazoku] nuclear family
核開発[kakukaihatsu] nuclear development
核災害[kakusaigai] nuclear disaster

核酸[kakusan] nucleic acid
核子[kakushi] nucleon
核実験[kakujikken] nuclear (bomb) test
核心[kakushin] core

痔核[jikaku] hemorrhoid
痔瘻[jirou] anal fistula
切痔[kireji] anal fistula

吮癰舐痔[senyoushiji] currying favour (favor)
痔疾[jishitsu] hemorrhoids
疣痔[iboji] hemorrhoid