vitamin vs nutriment

vitamin and nutriment both are nouns.

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

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

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

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

vitamin (noun)	nutriment (noun)
any of a group of organic substances essential in small quantities to normal metabolism	a source of materials to nourish the body