butterfly effect vs upshot

butterfly effect and upshot both are nouns.

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

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

butterfly effect: the phenomenon whereby a small change at one place in a complex system can have large effects elsewhere, e.g., a butterfly flapping its wings in Rio de Janeiro might change the weather in Chicago
upshot: a phenomenon that follows and is caused by some previous phenomenon

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

butterfly effect (noun)	upshot (noun)
the phenomenon whereby a small change at one place in a complex system can have large effects elsewhere, e.g., a butterfly flapping its wings in Rio de Janeiro might change the weather in Chicago	a phenomenon that follows and is caused by some previous phenomenon