WordNet (r) 3.0 (2006):

scrounger
    n 1: someone who mooches or cadges (tries to get something free)
         [syn: moocher, mooch, cadger, scrounger]

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "scrounger":
   beggar, body snatcher, booster, bum, bummer, cadger, chicken thief,
   con man, crook, den of thieves, embezzler, filcher, ganef, ghoul,
   grafter, grave robber, hobo, jewel thief, land pirate, land shark,
   land-grabber, larcener, larcenist, lifter, loafer, mendicant,
   mendicant friar, mendicant order, moocher, panhandler, peculator,
   petty thief, pilferer, poacher, prowler, purloiner, robber,
   schnorrer, shoplifter, sneak thief, stealer, swindler, thief,
   tramp, white-collar thief