flour vs soybean flour

flour and soybean flour both are nouns.

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

As nouns, soybean flour is a hyponym of flour; that is, soybean 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
soybean flour: meal made from soybeans

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

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

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