myrtle flag vs Acorus calamus

myrtle flag and Acorus calamus both are nouns.

Word	Noun	Adjective	Verb	Adverb
myrtle flag	Yes	No	No	No
Acorus calamus	Yes	No	No	No

As nouns, myrtle flag and Acorus calamus are synonyms defined as:

myrtle flag and Acorus calamus: perennial marsh plant having swordlike leaves and aromatic roots

Other synonyms of myrtle flag include calamus, flagroot, sweet calamus, sweet flag.

myrtle flag (noun)	Acorus calamus (noun)
perennial marsh plant having swordlike leaves and aromatic roots	perennial marsh plant having swordlike leaves and aromatic roots