eager beaver vs worker

eager beaver and worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
eager beaver	Yes	No	No	No
worker	Yes	No	No	No

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

Other hypernyms of eager beaver include actor, doer.

eager beaver (noun)	worker (noun)
an alert and energetic 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