tocainide vs antiarrhythmic

tocainide and antiarrhythmic both are nouns.

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

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

tocainide: antiarrhythmic drug (trade name Tonocard) used to treat ventricular arrhythmias when less dangerous drugs have failed
antiarrhythmic: a drug used to treat an abnormal heart rhythm

Other hypernyms of tocainide include antiarrhythmic drug, antiarrhythmic medication.

tocainide (noun)	antiarrhythmic (noun)
antiarrhythmic drug (trade name Tonocard) used to treat ventricular arrhythmias when less dangerous drugs have failed	a drug used to treat an abnormal heart rhythm