Here's what rhymes with upperback.
back attack pack jack tack aback tak black lack track stack nach plaque rack sac sack hack fac knack lac shack mac mak unpack whack wrack yak mack wack yack crack slack paperback smack snack flak quack clack ipecac lumberjack claque flack repack applejack pickaback highjack mudpack elegiac shellac zodiac hardtack piggyback anorak crackerjack razorback thumbtack skyjack cardiac counterattack almanac maniac quarterback stickleback gunnysack rickrack demoniac haversack amnesiac steeplejack insomniac nymphomaniac megalomaniac Words that almost rhyme with upperback
bag tag dag drag lag rag gag hag stag wag brag fag mag nag sag zag shag blag toerag flag slag crag snag swag saddlebag dishrag fleabag scrag washrag nosebag chinwag scalawag wigwag sleazebag lollygag lallygag scallywag bank task tank bask dank talc basque rank blank thank drank mask sank plank cask masque shank hanc lank prank hank spank stank yank flank flask frank crank shrank franc antitank clank unmask swank databank outrank charabanc embank riverbank pointblank