ritonavir vs protease inhibitor

ritonavir and protease inhibitor both are nouns.

Word	Noun	Adjective	Verb	Adverb
ritonavir	Yes	No	No	No
protease inhibitor	Yes	No	No	No

As nouns, protease inhibitor is a hypernym of ritonavir; that is, protease inhibitor is a word with a broader meaning than ritonavir:

ritonavir: a protease inhibitor (trade name Norvir) used in treating HIV
protease inhibitor: an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs

Other hypernyms of ritonavir include PI.

ritonavir (noun)	protease inhibitor (noun)
a protease inhibitor (trade name Norvir) used in treating HIV	an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs