sustenance vs mess

sustenance and mess both are nouns.

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

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

sustenance (noun)	mess (noun)
the act of sustaining life by food or providing a means of subsistence	a (large) military dining room where service personnel eat or relax
a source of materials to nourish the body	a meal eaten in a mess hall by service personnel
the financial means whereby one lives	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

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