aftermath vs upshot

aftermath and upshot both are nouns.

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

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

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

aftermath (noun)	upshot (noun)
the outcome of an event especially as relative to an individual	a phenomenon that follows and is caused by some previous phenomenon
the consequences of an event (especially a catastrophic event)