Vertex rhymes with:
adaptec's, ameritech's, ametek's, armtek's, audiotex, avtex, aztecs, biotechs, centex, cytotechs, discotheques, entex, equitex, eyetech's, gatx, genentech's, gtech's, intex, kaisertech's, latex, memtec's, metex, natec's, pillowtex, playtex, portec's, qintex, railtex, scitex, symantec's, syntex, trintex, ventritex, videotex, wedtech's, westtech's
Vertex sounds like:
varieties, varity's, verdes, verdi's, verdugo, verduzco, verities, verity's, vertigo, vertucci, vertz, vibrates, viratek, viridis, virts, virtues, virtuoso, virtuous, vortec, vortex