vitamin vs sustenance

vitamin and sustenance both are nouns.

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

As nouns, sustenance is a hypernym of vitamin; that is, sustenance is a word with a broader meaning than vitamin:

vitamin: any of a group of organic substances essential in small quantities to normal metabolism
sustenance: a source of materials to nourish the body

Other hypernyms of vitamin include aliment, alimentation, nourishment, nutriment, nutrition, victuals.

vitamin (noun)	sustenance (noun)
any of a group of organic substances essential in small quantities to normal metabolism	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