militant vs reformist

militant and reformist both are nouns.

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

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

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

militant (noun)	reformist (noun)
a militant reformer	a disputant who advocates reform

militant (adjective)	reformist (adjective)
showing a fighting disposition	favoring or promoting reform (often by government action)
disposed to warfare or hard-line policies
engaged in war