The Collaborative International Dictionary of English v.0.48:

nonworker \nonworker\ n.
   A person who does not work as s/he should.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

nonworker
    n 1: a person who does nothing [ant: worker]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "nonworker":
   beggar, bummer, cadger, coupon clippers, drone, freeloader,
   idle rich, leisure class, lounge lizard, lumpen proletariat,
   mendicant, moocher, panhandler, parasite, rentiers, spiv, sponger,
   the unemployable, the unemployed