sweet calamus vs myrtle flag

sweet calamus and myrtle flag both are nouns.

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

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

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

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

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