aftermath vs event

aftermath and event both are nouns.

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

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

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

aftermath (noun)	event (noun)
the outcome of an event especially as relative to an individual	something that happens at a given place and time
the consequences of an event (especially a catastrophic event)	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