The Collaborative International Dictionary of English v.0.48:

Gamekeeper \Game"keep`er\ (g[=a]m"k[=e]p`[~e]r), n.
   One who has the care of game, especially in a park or
   preserve. --Blackstone.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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