bog hemp vs herbaceous plant

bog hemp and herbaceous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
bog hemp	Yes	No	No	No
herbaceous plant	Yes	No	No	No

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

bog hemp: any of several flowering weeds of the genus Boehmeria lacking stinging hairs
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 bog hemp include herb.

bog hemp (noun)	herbaceous plant (noun)
any of several flowering weeds of the genus Boehmeria lacking stinging hairs	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests