Gambler n. : One who gambles.

Example:
First time Gambler what machine should I play first?

Taxonomy
bet, outcome, games, lay bet, bookmakers, wager, casino, the odds, Arbitrage betting, odds, free encyclopedia, investments, casino gambling games, regulation, states, losses, stakes, insurers.

Defination from the web:
Gambler) Jump to: navigation, search "Gamble" redirects here. For other uses, see Gamble (disambiguation). Caravaggio, The Cardsharps, c. 1594. ... Reinforcement schedules may also make gamblers persist in gambling even after repeated losses. ...