soya bean vs bean

soya bean and bean both are nouns.

Word	Noun	Adjective	Verb	Adverb
soya bean	Yes	No	No	No
bean	Yes	No	Yes	No

As nouns, bean is a hypernym of soya bean; that is, bean is a word with a broader meaning than soya bean:

soya bean: 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)
bean: any of various edible seeds of plants of the family Leguminosae used for food

Other hypernyms of soya bean include edible bean.

As nouns, bean is a hypernym of soya bean; that is, bean is a word with a broader meaning than soya bean:

soya bean: a source of oil; used for forage and soil improvement and as food
bean: any of various seeds or fruits that are beans or resemble beans

soya bean (noun)	bean (noun)
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)	informal terms for a human head
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	any of various edible seeds of plants of the family Leguminosae used for food
a source of oil; used for forage and soil improvement and as food	any of various leguminous plants grown for their edible seeds and pods
	any of various seeds or fruits that are beans or resemble beans

soya bean (verb)	bean (verb)
	hit on the head, especially with a pitched baseball