Actors' rhymes with:
actor's, actors, contractors', detractors, factors, factors', reactor's, reactors, refractors, tractors
Actors' sounds like:
actor's, actors, actress, actress's, actresses, actuaries, actuators, agitators, ashtrays, asterisk, asters, astor's, astorga, astra's, astros, austrasia, austria's, awestruck