occupational hazard vs hazard

occupational hazard and hazard both are nouns.

Word	Noun	Adjective	Verb	Adverb
occupational hazard	Yes	No	No	No
hazard	Yes	No	Yes	No

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

occupational hazard: any condition of a job that can result in illness or injury
hazard: a source of danger; a possibility of incurring loss or misfortune

Other hypernyms of occupational hazard include endangerment, jeopardy, peril, risk.

occupational hazard (noun)	hazard (noun)
any condition of a job that can result in illness or injury	an obstacle on a golf course
	an unknown and unpredictable phenomenon that causes an event to result one way rather than another
	a source of danger; a possibility of incurring loss or misfortune

occupational hazard (verb)	hazard (verb)
	put forward, of a guess, in spite of possible refutation
	take a risk in the hope of a favorable outcome
	put at risk