Yes, key 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)
"Key" Definition
noun
A button or lever that is depressed to operate a machine.
A button that is depressed to cause a corresponding character or function to be typed or executed by a typewriter or to be accepted as input by a computer.
A characteristic tone or level of intensity, as of a speech or sales campaign. Often used in combination: high-key; low-key.
A device, such as a wedge or pin, inserted to lock together mechanical or structural parts.
A low offshore island or reef, especially in the Gulf of Mexico; a cay.
verb
to lock with or as if with a key as.
To secure (as a pulley on a shaft) by a key.
To finish off (an arch) by inserting a keystone.
To regulate the musical pitch of.
To bring into harmony or conformity make appropriate.
biographical name
Francis Scott 1779–1843 Am. lawyer & author of “The Star-Spangled Banner”.
John (Phillip) 1961– prime min. of New Zealand (2008– ).
verb-transitive
Architecture To furnish (an arch) with a keystone.
Music To regulate the pitch of.
To bring into harmony; adjust or adapt.
To enter (data) into a computer by means of a keyboard.
To identify (a biological specimen).
idiom
In key In consonance with other factors.
Out of key Not in consonance with other factors.
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