WordNet (r) 3.0 (2006):

parolee
    n 1: someone released on probation or on parole [syn:
         probationer, parolee]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "parolee":
   POW, cageling, captive, chain gang, con, convict, detenu,
   ex-convict, gaolbird, internee, jailbird, lifer,
   political prisoner, prisoner, prisoner of war, stir bird,
   ticket-of-leave man, ticket-of-leaver, trusty