WordNet (r) 3.0 (2006):

moocher
    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:

36 Moby Thesaurus words for "moocher":
   beggar, bum, bummer, cadger, caller, company, coupon clippers,
   drone, freeloader, frequenter, gate-crasher, guest, habitue, hobo,
   idle rich, leisure class, loafer, lounge lizard,
   lumpen proletariat, mendicant, mendicant friar, mendicant order,
   nonworker, panhandler, parasite, rentiers, schnorrer, scrounger,
   spiv, sponger, the unemployable, the unemployed, tramp,
   uninvited guest, visitant, visitor