Meaning : A wild and exciting undertaking (not necessarily lawful).
Synonyms : dangerous undertaking, escapade, risky venture
Meaning : Take a risk in the hope of a favorable outcome.
Example :
When you buy these stocks you are gambling.
Synonyms : chance, gamble, hazard, risk, run a risk, take a chance, take chances
Meaning : Put at risk.
Example :
I will stake my good reputation for this.
Synonyms : hazard, jeopardize, stake, venture