Cancer's rhymes with:
cancers, advancers, answer's, answers, cancers, dancer's, dancers, dancers', lancers, advancers, announcers, answer's, answers, biosensors, bouncers, cancers, censors, cosponsors, dancer's, dancers, dancers', dispensers, freelancers, lancers, mincers, pincers, sensor's, sensors, spencer's, spencers, spenser's, spensers, sponsor's, sponsors
Cancer's sounds like:
cancerous, cancers, cankers, ceniceros, censors, changers, commissaries, commissars, conagra's, concierge, concourse, concourses, concurs, congress, congress', congress's, congresses, conjures, connoisseurs, conqueror's, conquerors, conquers