Mexitil vs antiarrhythmic drug

Mexitil and antiarrhythmic drug both are nouns.

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

As nouns, antiarrhythmic drug is a hypernym of Mexitil; that is, antiarrhythmic drug is a word with a broader meaning than Mexitil:

Mexitil: antiarrhythmic drug (trade name Mexitil) used to treat ventricular arrhythmias
antiarrhythmic drug: a drug used to treat an abnormal heart rhythm

Other hypernyms of Mexitil include antiarrhythmic, antiarrhythmic medication.

Mexitil (noun)	antiarrhythmic drug (noun)
antiarrhythmic drug (trade name Mexitil) used to treat ventricular arrhythmias	a drug used to treat an abnormal heart rhythm