[n] a conceited and self-centered person
egoist, swellhead
braggart, careerist, egocentric, egoist, fortune hunter, hog, individualist, know-it-all, lone wolf, loner, monopolist, narcissist, Narcissus, narcist, no modest violet, road hog, self-advancer, self-pleaser, self-seeker, self-server, smart aleck, swellhe