Yes, sill is a Scrabble word!
...and is worth 4 points in Scrabble, and 6 points in Words with Friends
sill
Noun
1. Structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure
2. (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock
What Scrabble words can I make with the letters in sill?
4 Letter Words
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3 Letter Words
2 Letter Words