Yes, apter is a Scrabble word!
...and is worth 7 points in Scrabble, and 8 points in Words with Friends
apter
Adjective
1. (usually followed by `to') naturally disposed toward
2. At risk of or subject to experiencing something usually unpleasant
3. Mentally quick and resourceful
4. Being of striking appropriateness and pertinence
What Scrabble words can I make with the letters in apter?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words