WordNet (r) 3.0 (2006):

con man
    n 1: a swindler who exploits the confidence of his victim [syn:
         confidence man, con man, con artist]

Moby Thesaurus II by Grady Ward, 1.0:

54 Moby Thesaurus words for "con man":
   body snatcher, booster, bunco artist, bunco steerer, cardsharp,
   cardsharper, carpetbagger, chicken thief, con artist,
   confidence man, crimp, crook, den of thieves, embezzler, filcher,
   ganef, ghoul, grafter, grave robber, horse coper, horse trader,
   jackleg, jewel thief, land pirate, land shark, land-grabber,
   larcener, larcenist, lifter, mortgage shark, peculator,
   pettifogger, petty thief, pilferer, pitchman, poacher, prowler,
   purloiner, robber, scrounger, shark, sharp, sharper, sharpie,
   shoplifter, shortchanger, shyster, slicker, sneak thief, spieler,
   stealer, swindler, thief, white-collar thief