Yes, soy is a Scrabble word!
...and is worth 6 points in Scrabble, and 5 points in Words with Friends
soy
Noun
1. A source of oil; used for forage and soil improvement and as food
2. 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
3. Thin sauce made of fermented soy beans
4. 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 soy?
2 Letter Words