mess jacket vs monkey jacket

mess jacket and monkey jacket both are nouns.

Word	Noun	Adjective	Verb	Adverb
mess jacket	Yes	No	No	No
monkey jacket	Yes	No	No	No

As nouns, mess jacket and monkey jacket are synonyms defined as:

mess jacket and monkey jacket: waist-length jacket tapering to a point at the back; worn by officers in the mess for formal dinners

Other synonyms of mess jacket include shell jacket.

mess jacket (noun)	monkey jacket (noun)
waist-length jacket tapering to a point at the back; worn by officers in the mess for formal dinners	waist-length jacket tapering to a point at the back; worn by officers in the mess for formal dinners