ribavirin vs antiviral drug

ribavirin and antiviral drug both are nouns.

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

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

ribavirin: an inhaled antiviral agent (trade name Virazole) that may be used to treat serious virus infections
antiviral drug: any drug that destroys viruses

Other hypernyms of ribavirin include antiviral, antiviral agent.

ribavirin (noun)	antiviral drug (noun)
an inhaled antiviral agent (trade name Virazole) that may be used to treat serious virus infections	any drug that destroys viruses