butterbur vs herbaceous plant

butterbur and herbaceous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
butterbur	Yes	No	No	No
herbaceous plant	Yes	No	No	No

As nouns, herbaceous plant is a hypernym of butterbur; that is, herbaceous plant is a word with a broader meaning than butterbur:

butterbur: small Eurasian herb having broad leaves and lilac-pink rayless flowers; found in moist areas
herbaceous plant: a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests

Other hypernyms of butterbur include herb.

butterbur (noun)	herbaceous plant (noun)
small Eurasian herb having broad leaves and lilac-pink rayless flowers; found in moist areas	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests