salt-rising bread vs breadstuff

salt-rising bread and breadstuff both are nouns.

Word	Noun	Adjective	Verb	Adverb
salt-rising bread	Yes	No	No	No
breadstuff	Yes	No	No	No

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

salt-rising bread: white wheat bread raised by a salt-tolerant bacterium in a mixture of salt and either cornmeal or potato pulp
breadstuff: food made from dough of flour or meal and usually raised with yeast or baking powder and then baked

Other hypernyms of salt-rising bread include bread, staff of life.

salt-rising bread (noun)	breadstuff (noun)
white wheat bread raised by a salt-tolerant bacterium in a mixture of salt and either cornmeal or potato pulp	food made from dough of flour or meal and usually raised with yeast or baking powder and then baked
	flour or meal or grain used in baking bread