Yes, soja is in the scrabble dictionary.

What is the meaning of soja?

Definitions of soja. 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. synonyms: Glycine max, soja bean, soy, soya, soya bean, soybean, soybean plant.

What does soja mean in Japanese?

Noun. soja m (plural sojas) soy (sauce) soy (plant)