ribavirin vs antiviral agent

ribavirin and antiviral agent both are nouns.

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

As nouns, antiviral agent is a hypernym of ribavirin; that is, antiviral agent 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 agent: any drug that destroys viruses

Other hypernyms of ribavirin include antiviral, antiviral drug.

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