finger food vs sustenance

finger food and sustenance both are nouns.

Word	Noun	Adjective	Verb	Adverb
finger food	Yes	No	No	No
sustenance	Yes	No	No	No

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

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

finger food (noun)	sustenance (noun)
food to be eaten with the fingers	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