Yes, sori is a Scrabble word!
...and is worth 4 points in Scrabble, and 4 points in Words with Friends
sori
Noun
1. A spore-producing structure in certain lichens and fungi
2. Cluster of sporangia usually on underside of a fern frond
What Scrabble words can I make with the letters in sori?
3 Letter Words
2 Letter Words