The Collaborative International Dictionary of English v.0.48:

Fisherman \Fish"er*man\, n.; pl. Fishermen.
   1. One whose occupation is to catch fish.
      [1913 Webster]

   2. (Naut.) A ship or vessel employed in the business of
      taking fish, as in the cod fishery.
      [1913 Webster]

WordNet (r) 3.0 (2006):

fisherman
    n 1: someone whose occupation is catching fish [syn:
         fisherman, fisher]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "fisherman":
   AB, Ancient Mariner, Argonaut, Dylan, Flying Dutchman, Neptune, OD,
   Poseidon, Varuna, able seaman, able-bodied seaman, angler,
   bluejacket, buccaneer, deep-sea man, dibber, dibbler, drift netter,
   drifter, fair-weather sailor, fisher, guddler, hearty, jack,
   jack afloat, jack-tar, jacker, jacky, jigger, limey, lobsterman,
   mariner, matelot, navigator, pirate, piscator, piscatorialist,
   piscatorian, privateer, sailor, salt, sea dog, sea rover, seafarer,
   seafaring man, seaman, shipman, tar, the compleat angler, trawler,
   troller, viking, water dog, whaler, windjammer, windsailor