苛斂[karen] oppression (e.g. taxation)
収斂[shuuren] astringency
収斂剤[shuurenzai] an astringent
聚斂[shuuren] (levying of a) heavy taxation

苛斂誅求[karenchuukyuu] imposing exacting (crushing, oppressive) taxes
収斂進化[shuurenshinka] convergent evolution
斂葬[rensou] interment

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