Asparagus plumosus vs herb

Asparagus plumosus and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
Asparagus plumosus	Yes	No	No	No
herb	Yes	No	No	No

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

Asparagus plumosus: a fernlike plant native to South Africa
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 plumosus include herbaceous plant.

Asparagus plumosus (noun)	herb (noun)
a fernlike plant native to South Africa	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