myrtle flag vs sweet calamus

myrtle flag and sweet calamus both are nouns.

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

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

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

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

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