Yes, byte is a Scrabble word!
...and is worth 9 points in Scrabble, and 9 points in Words with Friends
byte
Noun
1. A sequence of 8 bits (enough to represent one character of alphanumeric data) processed as a single unit of information
What Scrabble words can I make with the letters in byte?
3 Letter Words
2 Letter Words
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Words that can be created with an extra letter added to byte:
S:bytes