messy vs mess

messy is not a noun while mess is a noun.

Word	Noun	Adjective	Verb	Adverb
messy	No	Yes	No	No
mess	Yes	No	Yes	No

messy (noun)	mess (noun)
	a (large) military dining room where service personnel eat or relax
	a meal eaten in a mess hall by service personnel
	soft semiliquid food
	(often followed by `of') a large number or amount or extent
	a state of confusion and disorderliness
	informal terms for a difficult situation

messy (adjective)	mess (adjective)
dirty and disorderly

messy (verb)	mess (verb)
	make a mess of or create disorder in
	eat in a mess hall