sweepstakes

sweepstakes
    n 1: a lottery in which the prize consists of the money paid by
         the participants
    

Sweepstakes \Sweep"stakes`\, n.
   1. A winning of all the stakes or prizes; a sweepstake.
      [1913 Webster]

   2. sing. or pl. The whole money or other things staked at a
      horse race, a given sum being put up for each horse, all
      of which goes to the winner, or is divided among several,
      as may be previously agreed.
      [1913 Webster]

   3. A race for all the sums staked or prizes offered.
      [1913 Webster]
    

74 Moby Thesaurus words for "sweepstakes":
      Academy Award, Derby, Kentucky Derby, Nobel Prize, Oscar,
      Preakness Stakes, award, betting system, bingo, booby prize,
      card games, chase, chuck and toss, chuck farthing, chuck-a-luck,
      class lottery, consolation prize, crack-loo, crap game,
      crap shooting, craps, daily double, double-or-nothing,
      draft lottery, drawing, exacta, fan-tan, first prize, flat race,
      grab bag, handicap, handicap race, harness race, hazard,
      horse race, horse racing, hurdle race, interest lottery, jackpot,
      keno, lottery, lotto, martingale, number lottery, numbers pool,
      pari-mutuel, perfecta, pinball, pitch and toss, plate race, policy,
      prize, purse race, quarter-horse race, quinella, raffle, reward,
      rouge et noir, roulette, second prize, shell game, stake,
      stake race, steeplechase, superfecta, sweep, sweeps, sweepstake,
      the numbers, the numbers game, tombola, tontine,
      trente-et-quarante, trotting race