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ALUM
Alum (noun) — a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum. 2. (noun) a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum.
Alum is a valid 4-letter word worth 6 points in Scrabble (and Words With Friends letter values vary). Below are its anagrams and the shorter words hidden inside it.