flour vs foodstuff

flour and foodstuff both are nouns.

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

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

flour: fine powdery foodstuff obtained by grinding and sifting the meal of a cereal grain
foodstuff: a substance that can be used or prepared for use as food

Other hypernyms of flour include food product.

flour (noun)	foodstuff (noun)
fine powdery foodstuff obtained by grinding and sifting the meal of a cereal grain	(usually plural) consumer goods sold by a grocer
	a substance that can be used or prepared for use as food

flour (verb)	foodstuff (verb)
convert grain into flour
cover with flour