aftereffect vs outcome

aftereffect and outcome both are nouns.

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

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

aftereffect: any result that follows its cause after an interval
outcome: a phenomenon that follows and is caused by some previous phenomenon

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

aftereffect (noun)	outcome (noun)
any result that follows its cause after an interval	something that results
a delayed effect of a drug or therapy	a phenomenon that follows and is caused by some previous phenomenon