Princeton's WordNet
tail, tail assembly, empennage(noun)
the rear part of an aircraft
Synonyms:
fanny, tail, seat, butt, empennage, rear end, shadower, can, nates, shadow, fundament, posterior, buttocks, behind, stern, bottom, backside, bum, tail assembly, buns, hindquarters, tail end, derriere, tooshie, fag end, hind end, rump, keister, ass, prat, arse, quarter, rear, tush, after part, poop
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