proprietary vs nonproprietary

proprietary is a noun but nonproprietary is not a noun.

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

proprietary (noun)	nonproprietary (noun)
an unincorporated business owned by a single person who is responsible for its liabilities and entitled to its profits

proprietary (adjective)	nonproprietary (adjective)
protected by trademark or patent or copyright; made or produced or distributed by one having exclusive rights	not protected by trademark or patent or copyright