faker

from WordNet (r) 3.0 (2006)

faker
    n 1: a person who makes deceitful pretenses [syn: {imposter},
         {impostor}, {pretender}, {fake}, {faker}, {fraud}, {sham},
         {shammer}, {pseudo}, {pseud}, {role player}]

from The Collaborative International Dictionary of English v.0.48

faker \fak"er\, n. [Sometimes erroneously written fakir.]
   1. One who fakes something; as
      (a) a thief.
      (b), a peddler of petty things.
      (c) a workman who dresses things up. [Slang]
          [Webster 1913 Suppl.]

   2. a person who makes deceitful pretenses.

   Syn: imposter, impostor, pretender, fake, fraud, sham,
        pseudo, pseud, role player.
        [WordNet 1.5]