Cnidoscolus urens vs herb

Cnidoscolus urens and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cnidoscolus urens	Yes	No	No	No
herb	Yes	No	No	No

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

Cnidoscolus urens: a stinging herb of tropical America
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 Cnidoscolus urens include herbaceous plant.

Cnidoscolus urens (noun)	herb (noun)
a stinging herb of tropical America	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