Yes, laugh is playable
...and is worth 11 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Laugh" Definition
noun
Informal Fun; amusement. Often used in the plural: went along just for laughs.
Informal Something amusing, absurd, or contemptible; a joke: The solution they recommended was a laugh.
The sound of laughing; laughter.
An expression of scorn or mockery .
phrasal-verb
Laugh at To treat lightly; scoff at: a daredevil who laughed at danger.
Off To dismiss as ridiculously or laughably trivial: laughed off any suggestion that her career was over.
verb-transitive
To affect or influence by laughter: laughed the speaker off the stage; laughed the proposal down.
To say with a laugh: He laughed his delight at the victory.
verb-intransitive
To express certain emotions, especially mirth or delight, by a series of spontaneous, usually unarticulated sounds often accompanied by corresponding facial and bodily movements.
To feel or express derision or contempt; mock: I had to laugh when I saw who my opponent was.
To produce sounds resembling laughter: parrots laughing and chattering in the trees.
To show or feel amusement or good humor: an experience we would laugh about later on.
verb
To influence or move by laughter .
To produce the sound or appearance of .
To be of a kind that inspires joy.
To become amused or derisive .
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