butterflower vs herb

butterflower and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
butterflower	Yes	No	No	No
herb	Yes	No	No	No

As nouns, herb is a hypernym of butterflower; that is, herb is a word with a broader meaning than butterflower:

butterflower: any of various plants of the genus Ranunculus
herb: a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests

Other hypernyms of butterflower include herbaceous plant.

butterflower (noun)	herb (noun)
any of various plants of the genus Ranunculus	aromatic potherb used in cookery for its savory qualities
	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests