black eye vs setback

black eye and setback both are nouns.

Word	Noun	Adjective	Verb	Adverb
black eye	Yes	No	No	No
setback	Yes	No	No	No

As nouns, black eye and setback are synonyms defined as:

black eye and setback: an unfortunate happening that hinders or impedes; something that is thwarting or frustrating

Other synonyms of black eye include blow, reversal, reverse.

black eye (noun)	setback (noun)
an unfortunate happening that hinders or impedes; something that is thwarting or frustrating	an unfortunate happening that hinders or impedes; something that is thwarting or frustrating
a swollen bruise caused by a blow to the eye
a bad reputation