nemophila vs herb

nemophila and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
nemophila	Yes	No	No	No
herb	Yes	No	No	No

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

nemophila: any plant of the genus Nemophila
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 nemophila include herbaceous plant.

nemophila (noun)	herb (noun)
any plant of the genus Nemophila	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