brown bread vs breadstuff

brown bread and breadstuff both are nouns.

Word	Noun	Adjective	Verb	Adverb
brown bread	Yes	No	No	No
breadstuff	Yes	No	No	No

As nouns, breadstuff is a hypernym of brown bread; that is, breadstuff is a word with a broader meaning than brown bread:

brown bread: dark steamed bread made of cornmeal wheat and flour with molasses and soda and milk or water
breadstuff: food made from dough of flour or meal and usually raised with yeast or baking powder and then baked

Other hypernyms of brown bread include bread, staff of life.

As nouns, breadstuff is a hypernym of brown bread; that is, breadstuff is a word with a broader meaning than brown bread:

brown bread: bread made with whole wheat flour
breadstuff: food made from dough of flour or meal and usually raised with yeast or baking powder and then baked

Other hypernyms of brown bread include bread, staff of life.

brown bread (noun)	breadstuff (noun)
dark steamed bread made of cornmeal wheat and flour with molasses and soda and milk or water	food made from dough of flour or meal and usually raised with yeast or baking powder and then baked
bread made with whole wheat flour	flour or meal or grain used in baking bread