very important person vs panjandrum

very important person and panjandrum both are nouns.

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

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

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

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

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