Payload's rhymes with:
payloads, payloads, boatloads, carloads, caseloads, downloads, overloads, payloads, planeloads, shiploads, truckloads, workloads
Payload's sounds like:
palates, pallets, paltz, payloads, pellets, pelts, peltz, pilatus, pillowtex, pilot's, pilots, pilots', piltz, plaits, platek, plates, platitudes, plato's, platts, platz, plaudits, plautz, playtex, pleads, pleats, pledge, pledges, pleiades, pleiads, pletz, ploetz, plots, plotts, plotz, pluto's, polites, politic, politicize, politico, politicos, politics, politics', politis, politz, pollutes, polytech, poultice, poultices, publitech, pullouts, pultz