free spirit vs worker

free spirit and worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
free spirit	Yes	No	No	No
worker	Yes	No	No	No

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

Other hypernyms of free spirit include actor, doer.

free spirit (noun)	worker (noun)
someone acting freely or even irresponsibly	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