egg vs foodstuff

egg and foodstuff both are nouns.

Word	Noun	Adjective	Verb	Adverb
egg	Yes	No	Yes	No
foodstuff	Yes	No	No	No

As nouns, foodstuff is a hypernym of egg; that is, foodstuff is a word with a broader meaning than egg:

Other hypernyms of egg include food product.

egg (noun)	foodstuff (noun)
animal reproductive body consisting of an ovum or embryo together with nutritive and protective envelopes; especially the thin-shelled reproductive body laid by e.g. female birds	(usually plural) consumer goods sold by a grocer
one of the two male reproductive glands that produce spermatozoa and secrete androgens	a substance that can be used or prepared for use as food
oval reproductive body of a fowl (especially a hen) used as food

egg (verb)	foodstuff (verb)
coat with beaten egg
throw eggs at