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SILL
Sill (noun) — structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure. 2. (noun) (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock.
Sill is a valid 4-letter word worth 4 points in Scrabble (and Words With Friends letter values vary). Below are its anagrams and the shorter words hidden inside it.