rye flour vs flour

rye flour and flour both are nouns.

Word	Noun	Adjective	Verb	Adverb
rye flour	Yes	No	No	No
flour	Yes	No	Yes	No

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

rye flour: flour made from ground rye grain.
flour: fine powdery foodstuff obtained by grinding and sifting the meal of a cereal grain

rye flour (noun)	flour (noun)
flour made from ground rye grain.	fine powdery foodstuff obtained by grinding and sifting the meal of a cereal grain

rye flour (verb)	flour (verb)
	convert grain into flour
	cover with flour