The Collaborative International Dictionary of English v.0.48:

game warden \game warden\ n.
   a public official who is responsible for the enforcement of
   laws regarding the hunting of animals.

   Syn: gamekeeper, game warden. [WordNet 1.5]

WordNet (r) 3.0 (2006):

game warden
    n 1: a person employed to take care of game and wildlife [syn:
         gamekeeper, game warden]

Moby Thesaurus II by Grady Ward, 1.0:

35 Moby Thesaurus words for "game warden":
   Audubon Society, National Wildlife Service, Sierra Club,
   air warden, attendant, caretaker, castellan, conservationist,
   conservator, curator, custodian, deliverer, forest ranger,
   gamekeeper, governor, guardian, guardian angel, janitor, keeper,
   lifeguard, lifesaver, next friend, preservationist, preserver,
   prochein ami, ranger, rescuer, safekeeper, saver, savior, shepherd,
   steward, taxidermist, warden, warder