sweet calamus vs sweet flag

sweet calamus and sweet flag both are nouns.

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

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

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

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

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