WordNet (r) 3.0 (2006):

staff of life
    n 1: food made from dough of flour or meal and usually raised
         with yeast or baking powder and then baked [syn: bread,
         breadstuff, staff of life]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "staff of life":
   French bread, Irish soda bread, Italian bread, black bread, bread,
   bread stick, bread stuff, brown bread, cracked-wheat bread, crust,
   dark bread, garlic bread, graham bread, loaf of bread, matzo,
   matzoth, nut bread, pain, pita, pumpernickel, raisin bread,
   rye bread, salt-rising bread, sourbread, sourdough bread, toast,
   tommy, unleavened bread, white bread, whole wheat bread