caseworker vs social worker

caseworker and social worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
caseworker	Yes	No	No	No
social worker	Yes	No	No	No

As nouns, caseworker and social worker are synonyms defined as:

caseworker and social worker: someone employed to provide social services (especially to the disadvantaged)

Other synonyms of caseworker include welfare worker.

caseworker (noun)	social worker (noun)
someone employed to provide social services (especially to the disadvantaged)	someone employed to provide social services (especially to the disadvantaged)