fallout vs event

fallout and event both are nouns.

Word	Noun	Adjective	Verb	Adverb
fallout	Yes	No	No	No
event	Yes	No	No	No

As nouns, event is a hypernym of fallout; that is, event is a word with a broader meaning than fallout:

Other hypernyms of fallout include consequence, effect, issue, outcome, result, upshot.

fallout (noun)	event (noun)
any adverse and unwanted secondary effect	something that happens at a given place and time
the radioactive particles that settle to the ground after a nuclear explosion	a phenomenon located at a single point in space-time; the fundamental observational entity in relativity theory
	a phenomenon that follows and is caused by some previous phenomenon
	a special set of circumstances