proprietary drug vs drug

proprietary drug and drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
proprietary drug	Yes	No	No	No
drug	Yes	No	Yes	No

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

proprietary drug: a drug that has a trade name and is protected by a patent (can be produced and sold only by the company holding the patent)
drug: a substance that is used as a medicine or narcotic

proprietary drug (noun)	drug (noun)
a drug that has a trade name and is protected by a patent (can be produced and sold only by the company holding the patent)	a substance that is used as a medicine or narcotic

proprietary drug (verb)	drug (verb)
	administer a drug to
	use recreational drugs