hardstem bulrush vs Scirpus acutus

hardstem bulrush and Scirpus acutus both are nouns.

Word	Noun	Adjective	Verb	Adverb
hardstem bulrush	Yes	No	No	No
Scirpus acutus	Yes	No	No	No

As nouns, hardstem bulrush and Scirpus acutus are synonyms defined as:

hardstem bulrush and Scirpus acutus: widely distributed North American sedge having rigid olive green stems

Other synonyms of hardstem bulrush include hardstemmed bulrush.

hardstem bulrush (noun)	Scirpus acutus (noun)
widely distributed North American sedge having rigid olive green stems	widely distributed North American sedge having rigid olive green stems