Yes, out is playable
...and is worth 4 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Out" Definition
noun
Baseball A play in which a batter or base runner is retired.
Baseball The player retired in such a play.
Informal A means of escape: The window was my only out.
One that is out, especially one who is out of power.
Printing A word or other part of a manuscript omitted from the printed copy.
adverb
Away from a usual place: stepped out for a drink of water; went out for the evening.
Away from the center or middle: The troops fanned out.
Baseball So as to be retired, or counted as an out: He grounded out to the shortstop.
From among others: picked out the thief in the crowd.
From inside a building or shelter into the open air; outside: The boy went out to play.
adjective
Baseball Not allowed to continue to bat or run; retired.
Directed away from a place or center; outgoing: the out doorway.
Extinguished: The lights were out next door.
Informal Openly gay, lesbian, or bisexual: an out performer.
preposition
Beyond or outside of: Out this door is the garage.
Forth from; through: He fell out the window.
Within the area of: The house has a garden out back.
Non-standard contraction of out of:.
verb-transitive
Chiefly British To knock unconscious.
Sports To send (a tennis ball, for example) outside the court or playing area.
To expose (one considered to be heterosexual) as being gay, lesbian, or bisexual: a tabloid article that outed a well-known politican.
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