very important person vs dignitary

very important person and dignitary both are nouns.

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

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

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

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

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