The Collaborative International Dictionary of English v.0.48:

Forger \For"ger\, n.[Cf. F. forgeur metal worker, L. fabricator
   artificer. See Forge, n. & v. t., and cf. Fabricator.]
   One who forges, makes, of forms; a fabricator; a falsifier.
   [1913 Webster]

   2. Especially: One guilty of forgery; one who makes or issues
      a counterfeit document.
      [1913 Webster]

WordNet (r) 3.0 (2006):

forger
    n 1: someone who operates a forge
    2: someone who makes copies illegally [syn: forger,
       counterfeiter]

Moby Thesaurus II by Grady Ward, 1.0:

83 Moby Thesaurus words for "forger":
   Artful Dodger, Casanova, Don Juan, Hephaestus, Machiavel,
   Machiavelli, Machiavellian, Vulcan, Wayland, actor, ape,
   bamboozler, befuddler, beguiler, charmer, coin-clipper, coiner,
   conformist, copier, copycat, copyist, counterfeiter, cuckoo,
   deceiver, deluder, dissembler, dissimulator, dodger, double-dealer,
   duper, echo, echoer, echoist, enchanter, entrancer, faker, farrier,
   fooler, gay deceiver, hoaxer, hypnotizer, hypocrite, imitator,
   impersonator, impostor, jilt, jilter, joker, jokester, kidder,
   leg-puller, mesmerizer, metalworker, mime, mimer, mimic, mimicker,
   minter, mintmaster, misleader, mocker, mockingbird, moneyer,
   monkey, parrot, phony, plagiarist, plagiarizer, playactor,
   poll-parrot, polly, polly-parrot, poseur, practical joker, ragger,
   role-player, seducer, sheep, simulator, smith, spoofer, tease,
   teaser