Triglochin maritima vs arrow grass

Triglochin maritima and arrow grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Triglochin maritima	Yes	No	No	No
arrow grass	Yes	No	No	No

As nouns, Triglochin maritima and arrow grass are synonyms defined as:

Triglochin maritima and arrow grass: tufted perennial found in shallow water or marshland; sometimes poisons livestock

Triglochin maritima (noun)	arrow grass (noun)
tufted perennial found in shallow water or marshland; sometimes poisons livestock	tufted perennial found in shallow water or marshland; sometimes poisons livestock