Falsetto rhymes with:
stretto, aburto, akihito, appetito, barstow, bartow, cervesato, cristo, divertimento, gilberto, grotto, gusto, hirohito, humberto, huto, lamberto, legato, lotto, manifesto, mistletoe, murto, norberto, ostinato, otto, photo, pinto, potato, potatoe, presto, puerto, punto, saito, shinto, staccato, steptoe, stretto, swatow, tiptoe, tomato, umberto, undertow
Falsetto sounds like:
falgoust, falgout, falsehood, falsity, felicetti, felicitate, felicite, felicity, filched, filegate, flaccid, flagday, flagged, flashed, flashiest, flaxseed, fleeced, fleshed, flexed, flight, flighty, flocked, fluctuate, fluctuated, flushed, full-sized, fullest