flower child vs reformer

flower child and reformer both are nouns.

Word	Noun	Adjective	Verb	Adverb
flower child	Yes	No	No	No
reformer	Yes	No	No	No

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

flower child: someone who rejects the established culture; advocates extreme liberalism in politics and lifestyle
reformer: a disputant who advocates reform

Other hypernyms of flower child include crusader, meliorist, reformist, social reformer.

flower child (noun)	reformer (noun)
someone who rejects the established culture; advocates extreme liberalism in politics and lifestyle	an apparatus that reforms the molecular structure of hydrocarbons to produce richer fuel
	a disputant who advocates reform