Yes, what is playable
...and is worth 9 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"What" Definition
pronoun
One of how much value or significance: What are possessions to a dying man?.
That which; the thing that: Listen to what I tell you.
Whatever thing that: come what may.
Which kind, character, or designation: What are these objects?.
Which thing or which particular one of many: What are you having for dinner? What did she say?.
idiom
What for Informal A scolding or strong reprimand: The teacher gave the tardy student what for.
What have you What remains and need not be mentioned: a room full of chairs, lamps, radios, and what have you.
What if What does it matter if.
What if What would occur if; suppose that.
What it takes The necessary expertise or qualities needed for success: She has what it takes to be a doctor.
interjection
Chiefly British Used as a tag question, often to solicit agreement.
Used to express surprise, incredulity, or other strong and sudden excitement.
adjective
How great; how astonishing: What a fool!.
Whatever: They soon repaired what damage had been done.
Which one or ones of several or many: What college are you attending? You should know what musical that song is from.
How remarkable or striking for good or bad qualities.
The … that as much or as many … as.
adverb
How much; in what respect; how: What does it matter?.
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