Acorus calamus vs sweet flag

Acorus calamus and sweet flag both are nouns.

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

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

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

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

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