civil rights worker vs crusader

civil rights worker and crusader both are nouns.

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

As nouns, crusader is a hypernym of civil rights worker; that is, crusader 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
crusader: a disputant who advocates reform

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

civil rights worker (noun)	crusader (noun)
a leader of the political movement dedicated to securing equal opportunity for members of minority groups	a disputant who advocates reform