Muffles rhymes with:
ruffles, scuffles, shuffles, truffles, baffles, faithfuls, hopefuls, kreifels, lichtenfels, ophuls, panfuls, raffles, rifles, ruffles, schreifels, scuffles, shuffles, sniffles, stifles, stoffels, trifles, truffles, useful's, waffles, wyffels
Muffles sounds like:
maniples, manville's, maples, minneapolis, minneapolis's, mobil's, mobile's, mobiles, mobilize, monfils, monopoles, monopolies, monopolize, monopolizes, mumbles