Carum carvi vs herb

Carum carvi and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
Carum carvi	Yes	No	No	No
herb	Yes	No	No	No

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

Carum carvi: a Eurasian plant with small white flowers yielding caraway seed
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 Carum carvi include herbaceous plant.

Carum carvi (noun)	herb (noun)
a Eurasian plant with small white flowers yielding caraway seed	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