setback vs happening

setback and happening both are nouns.

Word	Noun	Adjective	Verb	Adverb
setback	Yes	No	No	No
happening	Yes	No	No	No

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

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

Other hypernyms of setback include natural event, occurrence, occurrent.

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