setback vs natural event

setback and natural event both are nouns.

Word	Noun	Adjective	Verb	Adverb
setback	Yes	No	No	No
natural event	Yes	No	No	No

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

setback: an unfortunate happening that hinders or impedes; something that is thwarting or frustrating
natural event: an event that happens

Other hypernyms of setback include happening, occurrence, occurrent.

setback (noun)	natural event (noun)
an unfortunate happening that hinders or impedes; something that is thwarting or frustrating	an event that happens