This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Bread in any form or shape.

n. Flour, meal, or grain used in the baking of bread.

n. Flour, grain (such as wheat or oats), or any cereal, such as would be used in the making of bread

n. bread of any sort

n. Grain, flour, or meal of which bread is made.

n. Any kind of grain from which bread is made; meal; flour: generally used in the plural as a commercial term to signify all the different varieties of grain and flour collectively from which bread is made.

n. food made from dough of flour or meal and usually raised with yeast or baking powder and then baked

n. flour or meal or grain used in baking bread

"In most cases the runaway breadstuff is simpler than a gingerbread man: it’s a “thick, fat pancake” in the earliest printed version (from Germany in 1854), a “wee bunnock” in an early Scottish version, a johnny-cake in a tale from the American South."

food product    foodstuff