Yes, sonic is a Scrabble word!
...and is worth 7 points in Scrabble, and 9 points in Words with Friends
sonic
Adjective
1. (of speed) having or caused by speed approximately equal to that of sound in air at sea level
2. Relating to audible sound
What Scrabble words can I make with the letters in sonic?
5 Letter Words
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3 Letter Words
2 Letter Words