gromwell vs herbaceous plant

gromwell and herbaceous plant both are nouns.

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

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

gromwell: European perennial branching plant; occurs in hedgerows and at the edge of woodlands
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 gromwell include herb.

gromwell (noun)	herbaceous plant (noun)
European perennial branching plant; occurs in hedgerows and at the edge of woodlands	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests