THESAURUS
breech
afterpart, afterpiece, back, back door, back seat, back side, backside, bed, bedrock, behind, belly, bottom, bottom side, buttocks, derriere, downside, fanny, fundament, hardpan, heel, hind end, hind part, hindhead, lower side, lowest layer, lowest level, nether side, nethermost level, occiput, posterior, postern, rear, rear end, rearward, reverse, rock bottom, rump, stern, substratum, tail, tail end, tailpiece, underbelly, underlayer, underneath, underside
ROGET THESAURUS
breech
Rear
N
rear, back, posteriority, rear rank, rear guard, background, hinterland, occiput, nape, chine, heels, tail, rump, croup, buttock, posteriors, backside scut,
breech, dorsum, loin, dorsal region, lumbar region, hind quarters, aitchbone, natch, natch bone, stern, poop, afterpart, heelpiece, crupper, wake, train, reverse, other side of the shield, back, rear, hind, hinder, hindmost, hindermost, postern, posterior, dorsal, after, caudal, lumbar, mizzen, tergal, behind, in the rear, in the background, behind one's back, at the heels of, at the tail of, at the back of, back to back, after, aft, abaft, astern, sternmost, aback, rearward, ogni medaglia ha il suo rovescio, the other side of the coin.