Soja and Soja bean

Soja noun - 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.

Soja bean is a synonym for soja. In some cases you can use "Soja bean" instead a noun "Soja".

Soja bean noun - 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.

Soja is a synonym for soja bean. You can use "Soja" instead a noun phrase "Soja bean".