brand-name drug vs proprietary drug

brand-name drug and proprietary drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
brand-name drug	Yes	No	No	No
proprietary drug	Yes	No	No	No

As nouns, brand-name drug and proprietary drug are synonyms defined as:

brand-name drug and 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)

brand-name drug (noun)	proprietary 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 drug that has a trade name and is protected by a patent (can be produced and sold only by the company holding the patent)