black eye vs occurrence

black eye and occurrence both are nouns.

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

As nouns, occurrence is a hypernym of black eye; that is, occurrence is a word with a broader meaning than black eye:

black eye: an unfortunate happening that hinders or impedes; something that is thwarting or frustrating
occurrence: an event that happens

Other hypernyms of black eye include happening, natural event, occurrent.

black eye (noun)	occurrence (noun)
an unfortunate happening that hinders or impedes; something that is thwarting or frustrating	an event that happens
a swollen bruise caused by a blow to the eye	an instance of something occurring
a bad reputation