dignitary vs high muckamuck

dignitary and high muckamuck both are nouns.

Word	Noun	Adjective	Verb	Adverb
dignitary	Yes	No	No	No
high muckamuck	Yes	No	No	No

As nouns, dignitary and high muckamuck are synonyms defined as:

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

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

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