expert vs worker

expert and worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
expert	Yes	Yes	No	No
worker	Yes	No	No	No

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

Other hypernyms of expert include actor, doer.

expert (noun)	worker (noun)
a person with special knowledge or ability who performs skillfully	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

expert (adjective)	worker (adjective)
having or showing knowledge and skill and aptitude
of or relating to or requiring special knowledge to be understood