hazard-n; 3 Senses

Sense Number 1: a source or cause of danger

Commentary: HAZARD[+cause][+effective][+danger] [+relation][+role][+agent][+danger]

High levels of mercury in the drinking water posed a health hazard to the community.
That big pot hole in the road is a real hazard.
Insurance companies are exposed to a moral hazard if the insured party is not honest.
The patient is considered to be a hazard to herself.
John doesn't understand the financial hazards of selling stock short.

WordNet 3.0 Sense Numbers: 1

Sense Number 2: an unforeseen event, a chance occurrence

Commentary: HAZARD[+event][+unforeseen]
NOTE: a rare, and sometimes literary, usage

We met, by hazard, in the old book shop on 4th Avenue. (by chance)
It was only by hazard that he became king of the realm.

WordNet 3.0 Sense Numbers: 2

Sense Number 3: designed obstacle on a golf course

Commentary: HAZARD[+entity][+physical][+structure][+obstacle][+course][+golf]

Bob often loses a golf ball to the water hazard at the 13th hole.
This golf course has a number of difficult hazards, both sand and water.

WordNet 3.0 Sense Numbers: 3