Hyoscyamus muticus vs herb

Hyoscyamus muticus and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hyoscyamus muticus	Yes	No	No	No
herb	Yes	No	No	No

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

Hyoscyamus muticus: poisonous herb whose leaves are a source of hyoscyamine
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 Hyoscyamus muticus include herbaceous plant.

Hyoscyamus muticus (noun)	herb (noun)
poisonous herb whose leaves are a source of hyoscyamine	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