odd fish vs worker

odd fish and worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
odd fish	Yes	No	No	No
worker	Yes	No	No	No

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

odd fish: someone regarded as eccentric or crazy and standing out from a group
worker: a person who acts and gets things done

Other hypernyms of odd fish include actor, doer.

odd fish (noun)	worker (noun)
someone regarded as eccentric or crazy and standing out from a group	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