hazard
noun.
a source of danger; a possibility of incurring loss or misfortune
drinking alcohol is a health hazard
noun.
an unknown and unpredictable phenomenon that causes an event to result one way rather than another
bad luck caused his downfall|we ran into each other by pure chance
Synonym: chance, fortune, luck
noun.
an obstacle on a golf course
verb.
put forward, of a guess, in spite of possible refutation
I am guessing that the price of real estate will rise again|I cannot pretend to say that you are wrong
Synonym: guess, pretend, venture
verb.
put at risk
I will stake my good reputation for this
verb.
take a risk in the hope of a favorable outcome
When you buy these stocks you are gambling