Acorus calamus vs calamus

Acorus calamus and calamus both are nouns.

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

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

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

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

Acorus calamus (noun)	calamus (noun)
perennial marsh plant having swordlike leaves and aromatic roots	the hollow spine of a feather
	any tropical Asian palm of the genus Calamus; light tough stems are a source of rattan canes
	perennial marsh plant having swordlike leaves and aromatic roots
	the aromatic root of the sweet flag used medicinally