canned goods vs foodstuff

canned goods and foodstuff both are nouns.

Word	Noun	Adjective	Verb	Adverb
canned goods	Yes	No	No	No
foodstuff	Yes	No	No	No

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

Other hypernyms of canned goods include food product.

canned goods (noun)	foodstuff (noun)
food preserved by canning	(usually plural) consumer goods sold by a grocer
	a substance that can be used or prepared for use as food