antiviral vs medicinal drug

antiviral and medicinal drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
antiviral	Yes	Yes	No	No
medicinal drug	Yes	No	No	No

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

antiviral: any drug that destroys viruses
medicinal drug: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of antiviral include medicament, medication, medicine.

antiviral (noun)	medicinal drug (noun)
any drug that destroys viruses	(medicine) something that treats or prevents or alleviates the symptoms of disease

antiviral (adjective)	medicinal drug (adjective)
inhibiting or stopping the growth and reproduction of viruses