aftereffect vs event

aftereffect and event both are nouns.

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

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

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

aftereffect (noun)	event (noun)
any result that follows its cause after an interval	something that happens at a given place and time
a delayed effect of a drug or therapy	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