The Collaborative International Dictionary of English v.0.48:

narcissist \narcissist\ n.
   Someone in love with hisself or herself.

   Syn: narcist.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

narcissist
    n 1: someone in love with themselves [syn: narcissist,
         narcist]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "narcissist":
   Narcissus, braggart, bugger, careerist, coprophiliac, egocentric,
   egoist, egotist, erotomaniac, exhibitionist, fetishist,
   fortune hunter, hog, individualist, know-it-all, lone wolf, loner,
   masochist, monopolist, narcist, necrophiliac, no modest violet,
   nymphomaniac, paraphiliac, pederast, pedophiliac, rapist, road hog,
   sadist, satyr, scotophiliac, self-advancer, self-pleaser,
   self-seeker, self-server, smart aleck, sodomist, sodomite,
   swellhead, temporizer, timepleaser, timeserver, transvestite,
   tufthunter, voyeur, zoophiliac