common person vs doer

common person and doer both are nouns.

Word	Noun	Adjective	Verb	Adverb
common person	Yes	No	No	No
doer	Yes	No	No	No

As nouns, doer is a hypernym of common person; that is, doer is a word with a broader meaning than common person:

Other hypernyms of common person include actor, worker.

common person (noun)	doer (noun)
a person who holds no title	a person who acts and gets things done