common man vs worker

common man and worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
common man	Yes	No	No	No
worker	Yes	No	No	No

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

Other hypernyms of common man include actor, doer.

As nouns, worker is a hyponym of common man; that is, worker is a word with a more specific, narrower meaning than common man:

common man (noun)	worker (noun)
a person who holds no title	sterile member of a colony of social insects that forages for food and cares for the larvae
	a person who works at a specific occupation
	a member of the working class (not necessarily employed)
	a person who acts and gets things done