Yes, soya is a Scrabble word!
...and is worth 7 points in Scrabble, and 6 points in Words with Friends
soya
Noun
1. 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
2. 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)
What Scrabble words can I make with the letters in soya?
3 Letter Words
2 Letter Words