whole meal bread vs brown bread

whole meal bread and brown bread both are nouns.

Word	Noun	Adjective	Verb	Adverb
whole meal bread	Yes	No	No	No
brown bread	Yes	No	No	No

As nouns, whole meal bread and brown bread are synonyms defined as:

Other synonyms of whole meal bread include dark bread, whole wheat bread.

whole meal bread (noun)	brown bread (noun)
bread made with whole wheat flour	dark steamed bread made of cornmeal wheat and flour with molasses and soda and milk or water
	bread made with whole wheat flour