Fests rhymes with:
infests, arrests, attests, bequests, best's, breasts, chests, crests, digests, divests, guest's, guests, guests', infests, invests, jests, midwest's, molests, natwest's, nests, northwest's, norwest's, pests, quests, reinvests, requests, rests, retests, southwest's, suggests, test's, tests, tests', vests, west's
Fests sounds like:
facades, facet's, facetious, facets, factitious, facts, fajitas, fascists, fastidious, fasts, faucets, faught's, faustus, feasts, festus, fictitious, fight's, fights, fists, fixates, fojtik, fosdick, fossett's, foxwoods, fujitsu, fujitsu's, fustok