sustenance vs sustentation

sustenance and sustentation both are nouns.

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

As nouns, sustenance and sustentation are synonyms defined as:

sustenance and sustentation: the act of sustaining life by food or providing a means of subsistence

Other synonyms of sustenance include maintenance, sustainment, upkeep.

sustenance (noun)	sustentation (noun)
the act of sustaining life by food or providing a means of subsistence	the act of sustaining life by food or providing a means of subsistence
a source of materials to nourish the body
the financial means whereby one lives