Flexes rhymes with:
perplexes, exes, onex's, perplexes, x's, x.'s, x.s, affixes, alex's, alexs, amax's, amex's, annexes, apex's, appendixes, avtex's, axes, banks's, boomboxes, brooks's, cevaxs, cineplex's, climaxes, coaxes, comex's, cox's, crucifixes, cyrix's, dax's, dynamics's, endotronics's, essex's, exes, faxes, felix's, fixes, gearboxes, genex's, hoaxes, imax's, index's, indexes, ionics's, isomedix's, jukeboxes, knox's, lynxes, mailboxes, marks's, matchboxes, matrix's, matrixes, max's, metroplexes, miramax's, nixes, nynex's, onex's, outfoxes, paradoxes, patlex's, perplexes, phoenix's, relaxes, royex's, sachs's, saks's, six's, sixes, skyboxes, sox's, speakes's, spinks's, surtaxes, syntex's, tax's, taxes', telex's, telmex's, vaxes, waxes, wickes's, x's, x.'s, x.s, xerox's, xeroxes
Flexes sounds like:
faal's, fables, fabulous, fails, falasco, falck, falco, fales, falik, falise, falk, falke, falkowski, fall's, fallacies, fallacious, fallacy, fallis, fallish, fallows, falls, false, falwell's, faulk, faulks, febles, feels, felch, felice, felicia, felicia's, felis, felix, felix's, feliz, fellas, fellow's, fellowes, fellows, fells, fellsway, fels, felske, felucca, fialkowski, filch, files, filice, fillies, fills, filosa, flach, flack, flag, flagg, flags, flaig, flak, flake, flakes, flaky, flasch, flash, flash's, flashes, flashy, flask, flasks, flaugh, flawless, flaws, flax, fleas, fleck, flecks, fleece, fleeces, fleecy, fleek, flees, fleig, fleisch, fleiss, fleiss', fleiss's, flesch, flesh, fleshy, flex, flexi, flicek, flick, flicks, flies, flis, fliss, floc, flock, flocks, flog, flook, floss, flossie, flows, fluck, fluegge, fluke, flukes, flulike, flus, flush, flushes, flux, foale's, fobel's, foehlich, foibles, foiles, foils, folck, foley's, foliage, folic, folk, folkes, folkish, folks, folks', folksy, folkway, folkways, follies, follis, follows, folse, folz, fool's, foolish, fools, foulk, foulke, foulkes, foulks, fouls, fowles, fowlkes, fuel's, fuels, fulco, fulk, fulks, full's, full-size