The Collaborative International Dictionary of English v.0.48:

Deceiver \De*ceiv"er\, n.
   One who deceives; one who leads into error; a cheat; an
   impostor.
   [1913 Webster]

         The deceived and the deceiver are his.   --Job xii. 16.

   Syn: Deceiver, Impostor.

   Usage: A deceiver operates by stealth and in private upon
          individuals; an impostor practices his arts on the
          community at large. The one succeeds by artful
          falsehoods, the other by bold assumption. The
          faithless friend and the fickle lover are deceivers;
          the false prophet and the pretended prince are
          impostors.
          [1913 Webster]

WordNet (r) 3.0 (2006):

deceiver
    n 1: someone who leads you to believe something that is not true
         [syn: deceiver, cheat, cheater, trickster,
         beguiler, slicker]

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "deceiver":
   Judas, actor, affecter, bad person, betrayer, convict, criminal,
   crook, debaucher, defiler, delinquent, desperado,
   desperate criminal, despoiler, double-dealer, evildoer, fake,
   felon, fraud, fugitive, gallows bird, gangster, gaolbird,
   hollow man, jailbird, lawbreaker, malefactor, malevolent,
   malfeasant, malfeasor, man of straw, mannerist, misfeasor, mobster,
   outlaw, paper tiger, performer, phony, playactor, pretender,
   public enemy, quisling, racketeer, raper, rapist, ravager,
   ravisher, scofflaw, scoundrel, seducer, sinner, straw man,
   swindler, thief, thug, traitor, transgressor, two-timer, villain,
   violator, worker of ill, wrongdoer