Joe Bloggs vs man in the street

Joe Bloggs and man in the street both are nouns.

Word	Noun	Adjective	Verb	Adverb
Joe Bloggs	Yes	No	No	No
man in the street	Yes	No	No	No

As nouns, Joe Bloggs and man in the street are synonyms defined as:

Other synonyms of Joe Bloggs include Joe Blow, John Doe.

Joe Bloggs (noun)	man in the street (noun)
a hypothetical average man	a hypothetical average man