pasturage vs herbaceous plant

pasturage and herbaceous plant both are nouns.

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

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

pasturage: succulent herbaceous vegetation of pastureland
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 pasturage include herb.

pasturage (noun)	herbaceous plant (noun)
bulky food like grass or hay for browsing or grazing horses or cattle	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
succulent herbaceous vegetation of pastureland