foxglove vs herbaceous plant

foxglove and herbaceous plant both are nouns.

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

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

foxglove: any of several plants of the genus Digitalis
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 foxglove include herb.

foxglove (noun)	herbaceous plant (noun)
any of several plants of the genus Digitalis	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests