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.
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.
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.
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