Yes, sonar is a Scrabble word!
...and is worth 5 points in Scrabble, and 6 points in Words with Friends
sonar
Noun
1. A measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return
What Scrabble words can I make with the letters in sonar?
5 Letter Words
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3 Letter Words
2 Letter Words