Petasites sagitattus vs herb

Petasites sagitattus and herb both are nouns.

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

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

Petasites sagitattus: American sweet-scented herb
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 sagitattus include herbaceous plant.

Petasites sagitattus (noun)	herb (noun)
American sweet-scented herb	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