very important person vs VIP

very important person and VIP both are nouns.

Word	Noun	Adjective	Verb	Adverb
very important person	Yes	No	No	No
VIP	Yes	No	No	No

As nouns, very important person and VIP are synonyms defined as:

very important person and VIP: an important or influential (and often overbearing) person

Other synonyms of very important person include dignitary, high-up, high muckamuck, panjandrum.

very important person (noun)	VIP (noun)
an important or influential (and often overbearing) person	an important or influential (and often overbearing) person