worker vs causal agent

worker and causal agent both are nouns.

Word	Noun	Adjective	Verb	Adverb
worker	Yes	No	No	No
causal agent	Yes	No	No	No

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

worker: a person who acts and gets things done
causal agent: any entity that produces an effect or is responsible for events or results

Other hypernyms of worker include causal agency, cause.

worker (noun)	causal agent (noun)
sterile member of a colony of social insects that forages for food and cares for the larvae	any entity that produces an effect or is responsible for events or results
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