Yes, either is a Scrabble word!
...and is worth 9 points in Scrabble, and 8 points in Words with Friends
either
Adverb
1. After a negative statement used as an intensive meaning something like `likewise' or `also'
What Scrabble words can I make with the letters in either?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words