welfare worker vs caseworker

welfare worker and caseworker both are nouns.

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

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

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

Other synonyms of welfare worker include social worker.

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