unconstitutional vs constitutional

unconstitutional is not a noun while constitutional is a noun.

Word	Noun	Adjective	Verb	Adverb
unconstitutional	No	Yes	No	No
constitutional	Yes	Yes	No	No

unconstitutional (noun)	constitutional (noun)
	a regular walk taken as a form of exercise

unconstitutional (adjective)	constitutional (adjective)
not consistent with or according to a constitution; contrary to the U.S. Constitution	sanctioned by or consistent with or operating under the law determining the fundamental political principles of a government
	of benefit to or intended to benefit your physical makeup
	constitutional in the structure of something (especially your physical makeup)
	existing as an essential constituent or characteristic