sustenance vs nutrition

sustenance and nutrition both are nouns.

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

As nouns, sustenance and nutrition are synonyms defined as:

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

sustenance (noun)	nutrition (noun)
the act of sustaining life by food or providing a means of subsistence	the scientific study of food and drink (especially in humans)
a source of materials to nourish the body	a source of materials to nourish the body
the financial means whereby one lives	(physiology) the organic process of nourishing or being nourished; the processes by which an organism assimilates food and uses it for growth and maintenance