Synonyms and related words :
afterpart, afterpiece, back, back door, back seat, back side, backside, behind, bottom, breech, butt, buttocks, croup, crupper, fanny, haunches, heel, hind end, hind part, hindhead, nates, occiput, posterior, postern, rear, rearward, reverse, rump, seat, stern, tail, tail end, tailpiece