WordNet (r) 3.0 (2006):

goaltender
    n 1: the soccer or hockey player assigned to protect the goal
         [syn: goalkeeper, goalie, goaltender, netkeeper,
         netminder]
    2: the defensive position on an ice hockey or soccer or lacrosse
       team who stands in front of the goal and tries to prevent
       opposing players from scoring [syn: goalkeeper, goalie,
       goaltender, netkeeper]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "goaltender":
   advance guard, armed guard, bank guard, coast guard, cordon,
   cordon sanitaire, garrison, goalie, goalkeeper, guard, guarder,
   guardsman, inlying picket, jailer, outguard, outpost, picket,
   rear guard, security guard, train guard, van, vanguard, warder