mess vs great deal

mess and great deal both are nouns.

Word	Noun	Adjective	Verb	Adverb
mess	Yes	No	Yes	No
great deal	Yes	No	No	No

As nouns, mess and great deal are synonyms defined as:

mess and great deal: (often followed by `of') a large number or amount or extent

mess (noun)	great deal (noun)
a (large) military dining room where service personnel eat or relax	(often followed by `of') a large number or amount or extent
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

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