wheat germ vs sustenance

wheat germ and sustenance both are nouns.

Word	Noun	Adjective	Verb	Adverb
wheat germ	Yes	No	No	No
sustenance	Yes	No	No	No

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

wheat germ: embryo of the wheat kernel; removed before milling and eaten as a source of vitamins
sustenance: a source of materials to nourish the body

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

wheat germ (noun)	sustenance (noun)
embryo of the wheat kernel; removed before milling and eaten as a source of vitamins	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