antiarrhythmic drug vs antiarrhythmic

antiarrhythmic drug and antiarrhythmic both are nouns.

Word	Noun	Adjective	Verb	Adverb
antiarrhythmic drug	Yes	No	No	No
antiarrhythmic	Yes	No	No	No

As nouns, antiarrhythmic drug and antiarrhythmic are synonyms defined as:

antiarrhythmic drug and antiarrhythmic: a drug used to treat an abnormal heart rhythm

Other synonyms of antiarrhythmic drug include antiarrhythmic medication.

antiarrhythmic drug (noun)	antiarrhythmic (noun)
a drug used to treat an abnormal heart rhythm	a drug used to treat an abnormal heart rhythm