graham flour vs wheat flour

graham flour and wheat flour both are nouns.

Word	Noun	Adjective	Verb	Adverb
graham flour	Yes	No	No	No
wheat flour	Yes	No	No	No

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

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

graham 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