Reactors rhymes with:
reactor's, reactor's, actor's, actors, actors', contractors', detractors, factors, factors', reactor's, refractors, tractors
Reactors sounds like:
racetrack, racetracks, racketeers, reactor's, register's, registers, registrars, registries, resistors, restores, roasters, rochester's, roister's, roosters, rosters, royster's