cumfrey vs herbaceous plant

cumfrey and herbaceous plant both are nouns.

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

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

cumfrey: perennial herbs of Europe and Iran; make rapidly growing groundcover for shaded 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 cumfrey include herb.

cumfrey (noun)	herbaceous plant (noun)
perennial herbs of Europe and Iran; make rapidly growing groundcover for shaded areas	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests