bur reed vs herbaceous plant

bur reed and herbaceous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
bur reed	Yes	No	No	No
herbaceous plant	Yes	No	No	No

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

bur reed: marsh plant having elongated linear leaves and round prickly fruit
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 bur reed include herb.

bur reed (noun)	herbaceous plant (noun)
marsh plant having elongated linear leaves and round prickly fruit	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests