Yes, sima is a Scrabble word!
...and is worth 6 points in Scrabble, and 7 points in Words with Friends
sima
Noun
1. Rock that form the continuous lower layer of the earth's crust; rich in silicon and magnesium
What Scrabble words can I make with the letters in sima?
4 Letter Words
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3 Letter Words
2 Letter Words