bettor

from WordNet (r) 3.0 (2006)

bettor
    n 1: someone who bets [syn: {bettor}, {better}, {wagerer},
         {punter}]

from The Collaborative International Dictionary of English v.0.48

Bettor \Bet"tor\, n.
   One who bets; a better. --Addison.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

28 Moby Thesaurus words for "bettor":
      adventurer, betting ring, boneshaker, cardshark, cardsharp,
      cardsharper, compulsive gambler, crap shooter, gambler, gamester,
      hazarder, petty gambler, piker, player, plunger, punter, sharp,
      sharper, sharpie, speculator, sport, sporting man, sportsman,
      tinhorn, tipster, tout, venturer, wagerer