Words That Rhyme With "Muscles" :
2 syllables:
bristles, Brussels, bustle, castles, duffel, duffle, fossils, Gesell's, guzzle, hassles, hustles, mussels, nestles, nuzzle, puzzle, ruffles, russel, Russell's, Russia's, rustle, scuffles, shuffles, snuffle, thistles, truffles, tussal, tussles, vassals, vessels, whistles, wrestles
3 syllables:
apostles, crepuscle, kerfuffle, reshuffle, unruffle