Stachys sylvatica vs herb

Stachys sylvatica and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
Stachys sylvatica	Yes	No	No	No
herb	Yes	No	No	No

As nouns, herb is a hypernym of Stachys sylvatica; that is, herb is a word with a broader meaning than Stachys sylvatica:

Stachys sylvatica: foul-smelling perennial Eurasiatic herb with a green creeping rhizome
herb: a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests

Other hypernyms of Stachys sylvatica include herbaceous plant.

Stachys sylvatica (noun)	herb (noun)
foul-smelling perennial Eurasiatic herb with a green creeping rhizome	aromatic potherb used in cookery for its savory qualities
	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests