alimentation vs sustenance

alimentation and sustenance both are nouns.

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

As nouns, alimentation and sustenance are synonyms defined as:

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

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