WordNet (r) 3.0 (2006):

homosexual
    adj 1: sexually attracted to members of your own sex [ant:
           bisexual, heterosexual]
    n 1: someone who practices homosexuality; having a sexual
         attraction to persons of the same sex [syn: homosexual,
         homophile, homo, gay]

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "homosexual":
   AC-DC, amphierotic, androgynous, auntie, autoerotic, bent, bi-guy,
   bisexed, bisexual, bull dyke, butch, camp, campy, catamite,
   chicken, deviant, dike, dyke, effeminate, epicene, fag, faggot,
   fairy, femme, flit, fricatrice, fruit, fruity, gay, ginger beer,
   gunsel, homo, homoerotic, homophile, homosexualist, invert,
   inverted, kinky, lesbian, mannish, nance, nancy, pansy, pathic,
   pederast, pervert, perverted, punk, queen, queer, sapphic,
   sapphist, sodomite, swish, transvestite, tribade, tribadistic