man of the world vs worker

man of the world and worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
man of the world	Yes	No	No	No
worker	Yes	No	No	No

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

Other hypernyms of man of the world include actor, doer.

man of the world (noun)	worker (noun)
a worldly-wise person	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