constitutional vs unconstitutional

constitutional is a noun but unconstitutional is not a noun.

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

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

constitutional (adjective)	unconstitutional (adjective)
sanctioned by or consistent with or operating under the law determining the fundamental political principles of a government	not consistent with or according to a constitution; contrary to the U.S. Constitution
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