Yes, fewer is a Scrabble word!
...and is worth 11 points in Scrabble, and 11 points in Words with Friends
fewer
Adjective
1. (comparative of `few' used with count nouns) quantifier meaning a smaller number of
2. A quantifier that can be used with count nouns and is often preceded by `a'; a small but indefinite number
What Scrabble words can I make with the letters in fewer?
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Words that can be created with an extra letter added to fewer:
L:reflew