health hazard vs risk

health hazard and risk both are nouns.

Word	Noun	Adjective	Verb	Adverb
health hazard	Yes	No	No	No
risk	Yes	No	Yes	No

As nouns, risk is a hypernym of health hazard; that is, risk is a word with a broader meaning than health hazard:

Other hypernyms of health hazard include endangerment, hazard, jeopardy, peril.

health hazard (noun)	risk (noun)
hazard to the health of those exposed to it	a venture undertaken without regard to possible loss or injury
	the probability of being exposed to an infectious agent
	the probability of becoming infected given that exposure to an infectious agent has occurred
	a source of danger; a possibility of incurring loss or misfortune

health hazard (verb)	risk (verb)
	expose to a chance of loss or damage
	take a risk in the hope of a favorable outcome