Yes, speed 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)
"Speed" Definition
noun
A numerical expression of the sensitivity of a photographic film, plate, or paper to light.
A transmission gear or set of gears in a motor vehicle.
Archaic Prosperity; luck.
Physics Distance traveled divided by the time of travel.
Physics The limit of this quotient as the time of travel becomes vanishingly small; the first derivative of distance with respect to time.
verb-intransitive
Archaic To get along in a specified manner; fare.
Archaic To prove successful; prosper.
To drive at a speed exceeding a legal limit: was speeding on the freeway.
To go, move, or proceed quickly: sped to the rescue.
To move, work, or happen at a faster rate; accelerate: His pulse speeded up.
verb-transitive
Archaic To help to succeed or prosper; aid.
To cause to go, move, or proceed quickly; hasten.
To further, promote, or expedite (a legal action, for example).
To increase the speed or rate of; accelerate: speed up a car; sped production.
idiom
Up to speed Operating at maximum speed.
Up to speed Producing something or performing at an acceptable rate or level.
verb
To increase the speed of .
To cause to move quickly .
To further the success of.
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