The Collaborative International Dictionary of English v.0.48:

Backwoodsman \Back"woods"man\, n.; pl. Backwoodsmen.
   A man living in the forest in or beyond the new settlements,
   especially on the western frontiers of the United States in
   former times. --Fisher Ames.
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

backwoodsman
    n 1: a man who lives on the frontier [syn: frontiersman,
         backwoodsman, mountain man]

Moby Thesaurus II by Grady Ward, 1.0:

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