Purchasers' rhymes with:
purchaser's, purchasers, purchaser's, purchasers, purchaser's, purchasers, canvassers, flagofficers, officers, purchaser's, purchasers
Purchasers' 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, purchaser's, purchasers, pursuers