asparagus pea vs herb

asparagus pea and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
asparagus pea	Yes	No	No	No
herb	Yes	No	No	No

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

asparagus pea: sprawling European annual having a 4-winged edible pod
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 asparagus pea include herbaceous plant.

asparagus pea (noun)	herb (noun)
sprawling European annual having a 4-winged edible pod	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