amiodarone vs antiarrhythmic

amiodarone and antiarrhythmic both are nouns.

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

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

amiodarone: an antiarrhythmic drug (trade name Cordarone) that has potentially fatal side effects and is used to control serious heart rhythm problems only when safer agents have been ineffective
antiarrhythmic: a drug used to treat an abnormal heart rhythm

Other hypernyms of amiodarone include antiarrhythmic drug, antiarrhythmic medication.

amiodarone (noun)	antiarrhythmic (noun)
an antiarrhythmic drug (trade name Cordarone) that has potentially fatal side effects and is used to control serious heart rhythm problems only when safer agents have been ineffective	a drug used to treat an abnormal heart rhythm