sweet calamus vs Acorus calamus

sweet calamus and Acorus calamus both are nouns.

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

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

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

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

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