Parker's rhymes with:
parkers, barkers, markers, parkers, polymarkers, barkers, borchers, markers, millworkers, new-yorkers, parkers, polymarkers, porkers, yorker's, yorkers
Parker's sounds like:
paperworkers, parkers, parsers, perjures, porkers, preacher's, preachers, precarious, precrash, presser's, pressure's, pressures, pressurize, pressurizes, processor's, processors, progress, progresses, purchaser's, purchasers, purchasers', pursuers