The Collaborative International Dictionary of English v.0.48:

Lumberman \Lum"ber*man\, n.; pl. Lumbermen.
   One who is engaged in lumbering as a business or employment.
   [U.S.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

lumberman
    n 1: a person who fells trees [syn: lumberman, lumberjack,
         logger, feller, faller]