Prenanthes purpurea vs herb

Prenanthes purpurea and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
Prenanthes purpurea	Yes	No	No	No
herb	Yes	No	No	No

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

Prenanthes purpurea: herb of central and southern Europe having purple florets
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 Prenanthes purpurea include herbaceous plant.

Prenanthes purpurea (noun)	herb (noun)
herb of central and southern Europe having purple florets	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