苛む[sainamu] to torment
苛めっ子[ijimekko] bully
苛める[ijimeru] to tease
苛虐[kagyaku] cruel treatment
苛性[kasei] caustic

苛性ソーダ[kaseisooda] caustic soda
苛政[kasei] tyranny
苛税[kazei] heavy taxation
苛立つ[iradatsu] to be irritated
苛立てる[iradateru] to irritate