soybean flour vs soy flour

soybean flour and soy flour both are nouns.

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

As nouns, soybean flour and soy flour are synonyms defined as:

Other synonyms of soybean flour include soybean meal.

soybean flour (noun)	soy flour (noun)
meal made from soybeans	meal made from soybeans