quinidine vs antiarrhythmic

quinidine and antiarrhythmic both are nouns.

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

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

quinidine: cardiac drug (trade names Quinidex and Quinora) used to treat certain heart arrhythmias
antiarrhythmic: a drug used to treat an abnormal heart rhythm

Other hypernyms of quinidine include antiarrhythmic drug, antiarrhythmic medication.

quinidine (noun)	antiarrhythmic (noun)
cardiac drug (trade names Quinidex and Quinora) used to treat certain heart arrhythmias	a drug used to treat an abnormal heart rhythm