preservationist vs crusader

preservationist and crusader both are nouns.

Word	Noun	Adjective	Verb	Adverb
preservationist	Yes	No	No	No
crusader	Yes	No	No	No

As nouns, crusader is a hypernym of preservationist; that is, crusader is a word with a broader meaning than preservationist:

preservationist: someone who advocates the preservation of historical sites or endangered species or natural areas
crusader: a disputant who advocates reform

Other hypernyms of preservationist include meliorist, reformer, reformist, social reformer.

preservationist (noun)	crusader (noun)
someone who advocates the preservation of historical sites or endangered species or natural areas	a disputant who advocates reform