Senators' rhymes with:
senator's, senators, senator's, senators, janitors, monitors, senator's, senators, 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, marketers', micrometers, monitors, odometers, orators, orbiters, parameters, perimeters, picketers, predators, proprietor's, proprietors, rioters, secateurs, senator's, senators, solicitors, theater's, theaters, theatre's, theatres, thermometers, visitor's, visitors, visitors'
Senators' sounds like:
san-andreas, sanders, sanders's, sandrock, saunders, saunders', saunders's, saundra's, schneider's, schneiders, schneiders', schnieders, schnyder's, secondaries, senator's, senators, senders, senters, sentras, sentries, signatories, signatures, sinatra's, smathers, smethers, smithers, smothers, smotrich, snyder's, sonatrach, soundtrack, soundtracks, squanders, summiteers, syndrich, syntrex