demonstrator vs reformer

demonstrator and reformer both are nouns.

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

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

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

demonstrator (noun)	reformer (noun)
someone who participates in a public display of group feeling	an apparatus that reforms the molecular structure of hydrocarbons to produce richer fuel
someone who demonstrates an article to a prospective buyer	a disputant who advocates reform
a teacher or teacher's assistant who demonstrates the principles that are being taught