Superx rhymes with:
datarex, medarex, adaptaplex, adaptec's, ameritech's, ametek's, amex, ampex, annex, apec's, apex, armtek's, audiotex, avtex, aztecs, banamex, berlex, biotechs, bottlenecks, cemex, centex, cineplex, comex, comtrex, crownx, cybersex, cytotechs, datarex, defex, discotheques, duplex, entex, equitex, eurochecks, eyetech's, fanech's, finex, gatx, gendrisek's, genentech's, gtech's, hyponex, inmex, intex, kaisertech's, latex, medarex, mediplex, memorex, memtec's, metex, methanex, metroplex, middlesex, multidex, multiplex, natec's, neorx, nymex, nynex, opec's, oraflex, paychecks, paychex, pemex, pewex, pillowtex, playtex, portec's, prentnieks, qintex, railtex, rednecks, rolodex, roughnecks, scitex, simplex, starplex, steinbeck's, stratoflex, symantec's, syntex, teleflex, telex, telmex, tenrecs, timeplex, tridex, trintex, truex, turtlenecks, unisex, ventritex, vertex, videotex, visx, wedtech's, westtech's
Superx sounds like:
sabers, sabres, safarik, safaris, safire's, safra's, sagebrush, sapphires, sassafras, sassafras's, savarese, savers, savior's, saviors, savors, saybrook, schaberg, schaefers, schepers, schippers, scifres, seaberg, seabrook, seabrook's, seabrooks, seaburg, seafarers, seavers, seevers, severs, sevruga, sferrazza, sforza, shakespeare's, shapiro's, shapiros, shavers, shipper's, shippers, shipwreck, shivers, shoberg, shopper's, shoppers, shoppers', siebers, sievers, sifers, sjoberg, skipper's, skippers, sobers, sofer's, sparacio, sparaco, sparc, spares, spargo, spark, sparkes, sparks, sparky, sparrows, sparse, spears, speirs, speros, sperrazza, spheres, spiers, spires, spoor's, sporck, spores, spragg, sprague, sprague's, sprayers, sprays, sprees, sprick, sprigg, spriggs, sprizzo, sprock, sprogus, sprogus's, sprouse, spruce, spurge, spurious, spurs, sufferers, suffers, suffrage, superheroes, superhighway, superhighways, superior's, superiors, supers, suppers, suppress, suppresses, sverige, sweepers, syphers