Scrabble Dictionary

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Yes, alum is playable

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Found in the following dictionaries

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SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Alum" Definition

noun

Any of various double sulfates of a trivalent metal such as aluminum, chromium, or iron and a univalent metal such as potassium or sodium, especially aluminum potassium sulfate, AlK(SO4)2·12H2O, widely used in industry as clarifiers, hardeners, and purifiers and medicinally as topical astringents and styptics.

Source: American Heritage Dictionary

Informal An alumna or alumnus.

Source: American Heritage Dictionary

A potassium sulfate KAl(SO)·12HO or an ammonium aluminum sulfate NHAl(SO)·12HO used especially as an emetic and as an astringent and styptic.

Source: Merriam-Webster

Any of various double salts isomorphous with potassium aluminum sulfate.

Source: Merriam-Webster

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