flour vs soy flour

flour and soy flour both are nouns.

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

As nouns, soy flour is a hyponym of flour; that is, soy flour is a word with a more specific, narrower meaning than flour:

flour: fine powdery foodstuff obtained by grinding and sifting the meal of a cereal grain
soy flour: meal made from soybeans

Other hyponyms of flour include plain flour, wheat flour, soybean flour, soybean meal, semolina, rye flour.

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

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