kosher vs sustenance

kosher and sustenance both are nouns.

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

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

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

kosher (noun)	sustenance (noun)
food that fulfills the requirements of Jewish dietary law	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

kosher (adjective)	sustenance (adjective)
conforming to Jewish dietary laws
proper or legitimate