Yes, beat is playable
...and is worth 7 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Beat" Definition
noun
A member of the Beat Generation.
A pattern of stress that produces the rhythm of verse.
A stroke or blow, especially one that produces a sound or serves as a signal.
A variable unit of time measuring a pause taken by an actor, as for dramatic effect.
verb-transitive
Informal To arrive or finish before (another): We beat you home by five minutes.
Informal To avoid or counter the effects of, often by thinking ahead; circumvent: beat the traffic.
Informal To be superior to or better than: Riding beats walking.
Informal To deprive, as by craft or ability: He beat me out of 20 dollars with his latest scheme.
Music To mark or count (time or rhythm), especially with the hands or with a baton.
adjective
Informal Worn-out; fatigued.
Of or relating to the Beat Generation.
Being in a state of exhaustion .
Sapped of resolution or morale.
Of, relating to, or being .
verb-intransitive
Nautical To sail in the direction from which the wind blows.
To emit sound when struck: The gong beat thunderously.
To fall in torrents: The rain beat on the roof.
To hunt through woods or underbrush in search of game.
verb
To hit repeatedly so as to inflict pain .
To strike directly against forcefully and repeatedly dash against.
To flap or thrash at vigorously.
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