nemophila vs herbaceous plant

nemophila and herbaceous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
nemophila	Yes	No	No	No
herbaceous plant	Yes	No	No	No

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

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

nemophila (noun)	herbaceous plant (noun)
any plant of the genus Nemophila	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests