nepotist vs important person

nepotist and important person both are nouns.

Word	Noun	Adjective	Verb	Adverb
nepotist	Yes	No	No	No
important person	Yes	No	No	No

As nouns, important person is a hypernym of nepotist; that is, important person is a word with a broader meaning than nepotist:

nepotist: a powerful person who shows favoritism to relatives or close friends
important person: a person whose actions and opinions strongly influence the course of events

Other hypernyms of nepotist include influential person, personage.

nepotist (noun)	important person (noun)
a powerful person who shows favoritism to relatives or close friends	a person whose actions and opinions strongly influence the course of events