Yes, bisons is a Scrabble word!
...and is worth 8 points in Scrabble, and 10 points in Words with Friends
bisons
Noun
1. Any of several large humped bovids having shaggy manes and large heads and short horns
What Scrabble words can I make with the letters in bisons?
5 Letter Words
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3 Letter Words
2 Letter Words