Sour bread and Staff of life

Sour bread noun - Made with a starter of a small amount of dough in which fermentation is active.

Staff of life and sour bread are semantically related. In some cases you can use "Staff of life" instead a noun phrase "Sour bread".

Staff of life noun - Food made from dough of flour or meal and usually raised with yeast or baking powder and then baked.

Sour bread and staff of life are semantically related. Sometimes you can replace phrase "Sour bread" with "Staff of life", this phrases are similar.