Definitions of hazard:

• noun:   an obstacle on a golf course
• noun:   a source of danger; a possibility of incurring loss or misfortune

  Example: "Drinking alcohol is a health hazard"

• noun:   an unknown and unpredictable phenomenon that causes an event to result one way rather than another
• verb:   put at risk
• verb:   take a risk in the hope of a favorable outcome
• verb:   put forward, of a guess, in spite of possible refutation
• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #7483)