tossup vs hazard

tossup and hazard both are nouns.

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

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

tossup: an unpredictable phenomenon
hazard: an unknown and unpredictable phenomenon that causes an event to result one way rather than another

Other hypernyms of tossup include chance, fortune, luck.

tossup (noun)	hazard (noun)
an unpredictable phenomenon	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

tossup (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