side effect vs upshot

side effect and upshot both are nouns.

Word	Noun	Adjective	Verb	Adverb
side effect	Yes	No	No	No
upshot	Yes	No	No	No

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

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

side effect (noun)	upshot (noun)
any adverse and unwanted secondary effect	a phenomenon that follows and is caused by some previous phenomenon
a secondary and usually adverse effect of a drug or therapy