Yes, do is playable
...and is worth 3 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Do" Definition
noun
Chiefly British Slang A swindle; a cheat.
Informal An entertainment; a party: attended a big do at the embassy.
Music The first tone of the diatonic scale in solfeggio.
idiom
Can To prefer not to experience or deal with: I could do without their complaints.
Do (one) proud To act or perform in a way that gives cause for pride.
Do a disappearing act Informal To vanish.
Do away with To destroy; kill.
Do away with To make an end of; eliminate.
phrasal-verb
Do by To behave with respect to; deal with: The children have done well by their aged parents.
Do for To care or provide for; take care of.
Do in Slang To ruin utterly: Huge losses on the stock market did many investors in.
Do in Slang To tire completely; exhaust: The marathon did me in.
verb-transitive
Informal To make a tour of; visit: "[He] did 15 countries of Western Europe in only a few days” ( R.W. Apple, Jr.).
Informal To serve (a prison term): did time in jail; did five years for tax fraud.
Informal To travel (a specified distance): do a mile in four minutes.
Slang To cheat; swindle: do a relative out of an inheritance.
verb-intransitive
To carry on; manage: I could do without your interference.
To get along; fare: students who do well at school.
To make good use of something because of need: I could do with a hot bath.
To serve a specified purpose: This coat will do for another season.
Used after another verb for emphasis: Run quickly, do!.
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