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