IPA: /ˈfuːdˌstʌf/
KK: /fudstʌf/
A material that can be eaten or used to make food.
The store sells a variety of foodstuffs from around the world.
Foodstuff is formed from "food" (from Old English *fōda*, meaning nourishment) and "stuff" (from Old French *estoffe*, meaning material or substance). The word refers to materials or substances that provide nourishment.
Think of 'food' as nourishment and 'stuff' as material — together, they describe materials that nourish us.
No commonly confused words.