unobstructed vs patent

unobstructed is not a noun while patent is a noun.

Word	Noun	Adjective	Verb	Adverb
unobstructed	No	Yes	No	No
patent	Yes	Yes	Yes	No

unobstructed (noun)	patent (noun)
	an official document granting a right or privilege
	a document granting an inventor sole rights to an invention

unobstructed (adjective)	patent (adjective)
free from impediment or obstruction or hindrance	clearly revealed to the mind or the senses or judgment
	(of a bodily tube or passageway) open; affording free passage

unobstructed (verb)	patent (verb)
	make open to sight or notice
	obtain a patent for
	grant rights to; grant a patent for