Yes, fool is playable
...and is worth 8 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Fool" Definition
noun
A dessert made of stewed or puréed fruit mixed with cream or custard and served cold.
A member of a royal or noble household who provided entertainment, as with jokes or antics; a jester.
Archaic A mentally deficient person; an idiot.
Informal A person with a talent or enthusiasm for a certain activity: a dancing fool; a fool for skiing.
One who acts unwisely on a given occasion: I was a fool to have quit my job.
verb-intransitive
Informal To behave comically; clown.
Informal To feign; pretend: He said he had a toothache but he was only fooling.
Informal To speak or act facetiously or in jest; joke: I was just fooling when I said I had to leave.
To engage in idle or frivolous activity.
idiom
Play To act in an irresponsible or foolish manner.
Play To behave in a playful or comical manner.
verb-transitive
To confound or prove wrong; surprise, especially pleasantly: We were sure they would fail, but they fooled us.
To deceive or trick; dupe: "trying to learn how to fool a trout with a little bit of floating fur and feather” ( Charles Kuralt).
verb
To meddle, tamper, or experiment especially thoughtlessly or ignorantly .
To play or improvise a comic role.
To contend or fight without serious intent or with less than full strength .
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