[indianaV8]

Gambling:

v.intr.
1. To bet on an uncertain outcome, as of a contest.
2. To play a game of chance for stakes.
3. To take a risk in the hope of gaining an advantage or a benefit.
4. To engage in reckless or hazardous behavior: You are gambling with your health by continuing to smoke.
n.
1. A bet, wager, or other gambling venture.
2. An act or undertaking of uncertain outcome; a risk: I took a gamble that stock prices would rise.

Gambling is almost synonim of a risk.
Poker is gambling, as almost anything in life.
A poker player player does not gamble much more than anyone else (e.g. a nurse).