Yes, surd is a Scrabble word!
...and is worth 5 points in Scrabble, and 6 points in Words with Friends
surd
Adjective
1. Produced without vibration of the vocal cords
Noun
1. A consonant produced without sound from the vocal cords
What Scrabble words can I make with the letters in surd?
4 Letter Words
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3 Letter Words
2 Letter Words