Yes, sial is a Scrabble word!
...and is worth 4 points in Scrabble, and 5 points in Words with Friends
sial
Noun
1. The granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum
What Scrabble words can I make with the letters in sial?
4 Letter Words
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3 Letter Words
2 Letter Words