hazard in WordNet English dictionary

1. put at risk
   "I will stake my good reputation for this"
   venture  hazard  adventure  stake  jeopardize 
   
2. take a risk in the hope of a favorable outcome
   "When you buy these stocks you are gambling"
   gamble  chance  risk  hazard  take chances  adventure  run a risk  take a chance 
   
3. 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"
   guess  venture  pretend  hazard 
   

1. 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"
   luck  fortune  chance  hazard 
   
2. a source of danger; a possibility of incurring loss or misfortune
   "drinking alcohol is a health hazard"
   hazard  jeopardy  peril  risk  endangerment 
   
3. an obstacle on a golf course
   hazard