manna vs food

manna and food both are nouns.

Word	Noun	Adjective	Verb	Adverb
manna	Yes	No	No	No
food	Yes	No	No	No

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

manna: (Old Testament) food that God gave the Israelites during the Exodus
food: any substance that can be metabolized by an animal to give energy and build tissue

Other hypernyms of manna include nutrient.

manna (noun)	food (noun)
(Old Testament) food that God gave the Israelites during the Exodus	any substance that can be metabolized by an animal to give energy and build tissue
hardened sugary exudation of various trees	anything that provides mental stimulus for thinking
	any solid substance (as opposed to liquid) that is used as a source of nourishment