repast vs mess

repast and mess both are nouns.

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

As nouns, mess is a hyponym of repast; that is, mess is a word with a more specific, narrower meaning than repast:

repast (noun)	mess (noun)
the food served and eaten at one time	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

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