reformer vs disputant

reformer and disputant both are nouns.

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

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

Other hypernyms of reformer include controversialist, eristic.

reformer (noun)	disputant (noun)
an apparatus that reforms the molecular structure of hydrocarbons to produce richer fuel	a person who disputes; who is good at or enjoys controversy
a disputant who advocates reform