civil rights worker vs reformer

civil rights worker and reformer both are nouns.

Word	Noun	Adjective	Verb	Adverb
civil rights worker	Yes	No	No	No
reformer	Yes	No	No	No

As nouns, reformer is a hypernym of civil rights worker; that is, reformer is a word with a broader meaning than civil rights worker:

civil rights worker: a leader of the political movement dedicated to securing equal opportunity for members of minority groups
reformer: a disputant who advocates reform

Other hypernyms of civil rights worker include crusader, meliorist, reformist, social reformer.

civil rights worker (noun)	reformer (noun)
a leader of the political movement dedicated to securing equal opportunity for members of minority groups	an apparatus that reforms the molecular structure of hydrocarbons to produce richer fuel
	a disputant who advocates reform