Petroselinum crispum vs herb

Petroselinum crispum and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
Petroselinum crispum	Yes	No	No	No
herb	Yes	No	No	No

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

Petroselinum crispum: annual or perennial herb with aromatic leaves
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 Petroselinum crispum include herbaceous plant.

Petroselinum crispum (noun)	herb (noun)
annual or perennial herb with aromatic leaves	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