pokeweed vs herbaceous plant

pokeweed and herbaceous plant both are nouns.

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

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

pokeweed: perennial of the genus Phytolacca
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 pokeweed include herb.

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