WordNet (r) 3.0 (2006):

redneck
    n 1: a poor White person in the southern United States [syn:
         redneck, cracker]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "redneck":
   backwoodsman, briar-hopper, brush ape, bushman, clam digger,
   cracker, desert rat, forester, frontiersman, hillbilly,
   hinterlander, mountain man, mountaineer, piny, ridge runner,
   woodlander, woodman, woodsman