zalcitabine vs antiviral drug

zalcitabine and antiviral drug both are nouns.

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

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

zalcitabine: an antiviral drug used to combat HIV infection; a nucleoside analog reverse transcriptase inhibitor (NARTI)
antiviral drug: any drug that destroys viruses

Other hypernyms of zalcitabine include antiviral, antiviral agent.

zalcitabine (noun)	antiviral drug (noun)
an antiviral drug used to combat HIV infection; a nucleoside analog reverse transcriptase inhibitor (NARTI)	any drug that destroys viruses