plumbago vs herbaceous plant

plumbago and herbaceous plant both are nouns.

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

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

plumbago: any plumbaginaceous plant of the genus Plumbago
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 plumbago include herb.

plumbago (noun)	herbaceous plant (noun)
any plumbaginaceous plant of the genus Plumbago	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
used as a lubricant and as a moderator in nuclear reactors