Syntex's rhymes with:
amex's, genex's, index's, indexes, patlex's, royex'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, flexes, 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, tax's, taxes', telex's, telmex's, vaxes, waxes, wickes's, x's, x.'s, x.s, xerox's, xeroxes
Syntex's sounds like:
saint's, saints, saints', san-diego, sand's, sandage, sandhog, sandhogs, sandidge, sandos, sandose, sandoz, sandoz's, sands, sandusky, sandwich, sandwiches, sandwick, sandy's, sanitize, santa's, santas, santiago, santos, santosh, santosuosso, santucci, sassnet's, sassnets, scents, schantz, schematic, schmidt's, schmidtke, schmitz, schmutz, schnittke, schnitz, schwantes, second's, seconds, segment's, segments, semantic, semantics, sematech, semiotic, semiotics, semitic, semtex, senate's, sendak, sends, sentz, shands, shandwick, shandwick's, shanties, shantz, shawmut's, shindig, shontz, shunts, simmonds, simonds, skinheads, smith's, smiths, smithwick, smits, smooths, smoots, smudge, snatch, snatches, snitch, snout's, snouts, sonatas, sondag, sonnets, sonntag, sontag, sound's, sounds, sumita's, summit's, summits, sundae's, sunday's, sundays, sundews, swantek, symantec, symantec's, symmonds, symonds, synod's, syntax, syntech, syntex, syntheses, synthesis, synthesize, synthetic, synthetics