bedstraw vs herbaceous plant

bedstraw and herbaceous plant both are nouns.

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

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

bedstraw: any of several plants of the genus Galium
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 bedstraw include herb.

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