instance vs occurrent

instance and occurrent both are nouns.

Word	Noun	Adjective	Verb	Adverb
instance	Yes	No	Yes	No
occurrent	Yes	Yes	No	No

As nouns, occurrent is a hypernym of instance; that is, occurrent is a word with a broader meaning than instance:

Other hypernyms of instance include happening, natural event, occurrence.

instance (noun)	occurrent (noun)
an item of information that is typical of a class or group	an event that happens
an occurrence of something

instance (adjective)	occurrent (adjective)
	presently occurring (either causally or incidentally)

instance (verb)	occurrent (verb)
clarify by giving an example of