soy flour vs soya

soy flour and soya both are nouns.

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

soy flour (noun)	soya (noun)
meal made from soybeans	the most highly proteinaceous vegetable known; the fruit of the soybean plant is used in a variety of foods and as fodder (especially as a replacement for animal protein)
	erect bushy hairy annual herb having trifoliate leaves and purple to pink flowers; extensively cultivated for food and forage and soil improvement but especially for its nutritious oil-rich seeds; native to Asia