sustenance vs alimentation

sustenance and alimentation both are nouns.

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

As nouns, sustenance and alimentation are synonyms defined as:

Other synonyms of sustenance include aliment, nourishment, nutriment, nutrition, victuals.

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