ddC vs antiviral drug

ddC and antiviral drug both are nouns.

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

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

ddC: 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 ddC include antiviral, antiviral agent.

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