Superhighways rhymes with:
highway's, highways, byways, highway's, highways, airway's, airways, airways', alleyways, always, anyways, aways, broadway's, brockway's, byways, callaway's, cashways, castaways, causeways, doorways, driveways, edgeways, elway's, fairways, folkways, foodways, freeways, freightways, galloways, gateway's, gateways, getaways, giveaways, hallways, hathaway's, hemingway's, highway's, highways, leaseway's, lengthways, midway's, norway's, outweighs, pathways, railway's, railways, roadways, runaways, runways, safeway's, sideways, stairways, steinway's, strangwayes, subways, trailways, trailways', uruguay's, usairways, walkways, waterways
Superhighways 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, superior's, superiors, supers, superx, suppers, suppress, suppresses, sverige, sweepers, syphers