Yes, blank is playable
...and is worth 14 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Blank" Definition
noun
A document with one or more such spaces.
A manufactured article of a standard shape or form that is ready for final processing, as by stamping or cutting: a key blank.
A mark, usually a dash (—), indicating the omission of a word or of a letter or letters.
An empty space on a document to be filled in.
verb-intransitive
To become abstracted. Often used with out: My mind blanked out for a few seconds.
To fade away: The music gradually blanked out.
To fail to find or remember something: I blanked when asked the name of our mayor.
verb
To become confused or abstracted .
To keep (an opponent) from scoring .
adjective
Absolute; complete: a blank refusal.
Appearing or seeming to appear dazed or confused: greeted me with a blank stare.
Containing no information; unrecorded or erased: a blank tape; a blank diskette.
Devoid of activity, interest, or distinctive character; empty: tried to fill the blank hours of the day.
Devoid of thought or impression: a blank mind.
verb-transitive
Sports To prevent (an opponent) from scoring.
To block access to: blank off a subway tunnel.
To punch or stamp from flat stock, especially with a die.
To remove, as from view; obliterate: "At times the strong glare of the sun blanked it from sight” ( Richard Wright).
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