Comcast rhymes with:
amcast, amcast, broadcast, downcast, forecast, newscast, outcast, overcast, polycast, qualcast, rebroadcast, simulcast, telecast, triplecast, typecast
Comcast sounds like:
canasta, canoeist, canonized, canwest, changed, chemist, chengdu, cinched, cincotta, coincide, coincided, commenced, communicate, communicated, communist, comsat, concede, conceded, conceit, conceited, conchita, conchoid, concoct, concocted, congest, congested, conjugate, conjugated, connaught, connect, connected, conquest, consist, consisted, constitute, constituted