Petasites fragrans vs herb

Petasites fragrans and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
Petasites fragrans	Yes	No	No	No
herb	Yes	No	No	No

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

Petasites fragrans: European herb with vanilla-scented white-pink flowers
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 Petasites fragrans include herbaceous plant.

Petasites fragrans (noun)	herb (noun)
European herb with vanilla-scented white-pink flowers	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