Yes, sills is a Scrabble word!
...and is worth 5 points in Scrabble, and 7 points in Words with Friends
sills
Noun
1. United States operatic soprano (born in 1929)
2. Structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure
3. (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 sills?
4 Letter Words
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3 Letter Words
2 Letter Words