whole meal flour vs wheat flour

whole meal flour and wheat flour both are nouns.

Word	Noun	Adjective	Verb	Adverb
whole meal flour	Yes	No	No	No
wheat flour	Yes	No	No	No

As nouns, wheat flour is a hypernym of whole meal flour; that is, wheat flour is a word with a broader meaning than whole meal flour:

whole meal flour: flour made by grinding the entire wheat berry including the bran; (`whole meal flour' is British usage)
wheat flour: flour prepared from wheat

whole meal flour (noun)	wheat flour (noun)
flour made by grinding the entire wheat berry including the bran; (`whole meal flour' is British usage)	flour prepared from wheat