"gamble" in the noun sense
money that is risked for possible monetary gain
a risky act or venture
"gamble" in the verb sense
1. gamble, chance, risk, hazard, take chances, adventure, run a risk, take a chance
take a risk in the hope of a favorable outcome
"When you buy these stocks you are gambling"
play games for money
Source: WordNet® (An amazing lexical database of English)
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