Marketers' rhymes with:
marketer's, marketer's, marketer's, marketers, marketer's, marketers, picketers, secateurs, accelerometers, amphitheaters, arbiters, auditors, capacitors, catheters, competitor's, competitors, conservators, conspirators, contributors, curators, dieters, distributors, distributors', dosimeters, elaters, estimators, executors, exhibitors, inhibitors, inquisitors, interlocutors, interpreters, janitors, jupiter's, kilometers, magnetometers, marketer's, marketers, micrometers, monitors, odometers, orators, orbiters, parameters, perimeters, picketers, predators, proprietor's, proprietors, rioters, secateurs, senator's, senators, senators', solicitors, theater's, theaters, theatre's, theatres, thermometers, visitor's, visitors, visitors'
Marketers' sounds like:
marketeers, marketer's, marketers, marsters