dark bread vs staff of life

dark bread and staff of life both are nouns.

Word	Noun	Adjective	Verb	Adverb
dark bread	Yes	No	No	No
staff of life	Yes	No	No	No

As nouns, staff of life is a hypernym of dark bread; that is, staff of life is a word with a broader meaning than dark bread:

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

Other hypernyms of dark bread include bread, breadstuff.

dark bread (noun)	staff of life (noun)
bread made with whole wheat flour	food made from dough of flour or meal and usually raised with yeast or baking powder and then baked