militant vs reformer

militant and reformer both are nouns.

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

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

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

militant (noun)	reformer (noun)
a militant reformer	an apparatus that reforms the molecular structure of hydrocarbons to produce richer fuel
	a disputant who advocates reform

militant (adjective)	reformer (adjective)
showing a fighting disposition
disposed to warfare or hard-line policies
engaged in war