Yes, alter is a Scrabble word!
...and is worth 5 points in Scrabble, and 6 points in Words with Friends
alter
Verb
1. Cause to change; make different; cause a transformation
2. Become different in some particular way, without permanently losing one's or its former characteristics or essence
3. Make an alteration to
4. Insert words into texts, often falsifying it thereby
5. Remove the ovaries of
What Scrabble words can I make with the letters in alter?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words