Yes, wax is playable
...and is worth 13 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Wax" Definition
noun
A preparation containing wax used for polishing floors and other surfaces.
A resinous mixture used by shoemakers to rub on thread.
A solid plastic or pliable liquid substance, such as ozocerite or paraffin, originating from petroleum and found in rock layers and used in paper coating, as insulation, in crayons, and often in medicinal preparations.
Any of various natural, oily or greasy heat-sensitive substances, consisting of hydrocarbons or esters of fatty acids that are insoluble in water but soluble in nonpolar organic solvents.
verb-intransitive
To grow or become as specified: "could afford ... to wax sentimental over their heritage” ( John Simon).
To increase gradually in size, number, strength, or intensity.
To show a progressively larger illuminated area, as the moon does in passing from new to full.
verb
To treat or rub with wax usually for polishing, stiffening, or reducing friction.
To apply wax to (as legs) as a depilatory.
To record on phonograph records.
To defeat decisively (as in an athletic contest).
To increase in size, numbers, strength, prosperity, or intensity.
verb-transitive
Informal To make a phonograph record of.
To coat, treat, or polish with wax.
adjective
Made of wax: a wax candle.
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