bigwig vs influential person

bigwig and influential person both are nouns.

Word	Noun	Adjective	Verb	Adverb
bigwig	Yes	No	No	No
influential person	Yes	No	No	No

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

bigwig: the most important person in a group or undertaking
influential person: a person whose actions and opinions strongly influence the course of events

Other hypernyms of bigwig include important person, personage.

bigwig (noun)	influential person (noun)
the most important person in a group or undertaking	a person whose actions and opinions strongly influence the course of events