onion bread vs staff of life

onion bread and staff of life both are nouns.

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

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

onion bread: bread containing finely minced onions
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 onion bread include bread, breadstuff.

onion bread (noun)	staff of life (noun)
bread containing finely minced onions	food made from dough of flour or meal and usually raised with yeast or baking powder and then baked