Yes, sandhi is a Scrabble word!
...and is worth 10 points in Scrabble, and 10 points in Words with Friends
sandhi
Noun
1. The articulatory process whereby the pronunciation of a word or morpheme changes when it is followed immediately by another (especially in fluent speech)
What Scrabble words can I make with the letters in sandhi?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words