Utopian vs reformer

Utopian and reformer both are nouns.

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

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

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

Utopian (noun)	reformer (noun)
an idealistic (but usually impractical) social reformer	an apparatus that reforms the molecular structure of hydrocarbons to produce richer fuel
	a disputant who advocates reform

Utopian (adjective)	reformer (adjective)
of or pertaining to or resembling a utopia