preservationist vs reformer

preservationist and reformer both are nouns.

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

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

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

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

preservationist (noun)	reformer (noun)
someone who advocates the preservation of historical sites or endangered species or natural areas	an apparatus that reforms the molecular structure of hydrocarbons to produce richer fuel
	a disputant who advocates reform