WordNet sense 1 (a radio wave that can be modulated in order to transmit a signal):

carrier wave

WordNet sense 2 (a man who delivers the mail):

mailman, postman, letter carrier, mail carrier

WordNet sense 3 (someone whose employment involves carrying something):

bearer, toter

WordNet sense 4 (a boy who delivers newspapers):

newsboy

WordNet sense 5 ((medicine) a person (or animal) who has some pathogen to which he is immune but who can pass it on to others):

immune carrier

WordNet sense 6 (a person or firm in the business of transporting people or goods or messages):

common carrier

WordNet sense 7 (a large warship that carries planes and has a long flat deck for takeoffs and landings):

flattop, aircraft carrier, attack aircraft carrier