horehound vs herbaceous plant

horehound and herbaceous plant both are nouns.

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

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

horehound: any of various aromatic herbs of the genus Marrubium
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 horehound include herb.

horehound (noun)	herbaceous plant (noun)
a candy that is flavored with an extract of the horehound plant	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
any of various aromatic herbs of the genus Marrubium