gamble

[1]	risk , venture , hazard , bet , wager , stake , chance , speculate , play , game , (Brit) punt
[2]	gamble on , back , bet/wager on , stake/put money on , take a chance/flier on , try one's luck/fortune on , lay/place/make a wager/bet on , count on , rely on
[3]	chance , risk , hazard , take chances , adventure , run a risk , take a chance

[1]	chance , risk , venture , uncertainty , speculation , (Colloq) (US) crap-shoot
[2]	bet , wager , stake , (Brit) punt