This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One who plays at a game of chance, who gambles.

n. One who takes risks.

n. One who gambles.

n. One who gambles; one addicted to gaming or playing for money or other stakes; a gamester.

n. someone who risks loss or injury in the hope of gain or excitement

n. a person who wagers money on the outcome of games or sporting events

"But he also is one of the biggest gambles as he is a classic high-risk, high-return sort of riverboat gambler from the back end."

adventurer    venturer   

wagerer   

Ambler    ambler    rambler   

drunkard    thief    adventurer    liar    robber    speculator    idler    beggar    swindler    scoundrel