Purchaser's rhymes with:
purchasers, purchasers', purchasers, purchasers', purchasers, purchasers', canvassers, flagofficers, officers, purchasers, purchasers'
Purchaser's sounds like:
paperworkers, parker's, parkers, parsers, perjures, porkers, preacher's, preachers, precarious, precrash, presser's, pressure's, pressures, pressurize, pressurizes, processor's, processors, progress, progresses, purchasers, purchasers', pursuers