Yes, check is playable
...and is worth 17 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Check" Definition
noun
A bill at a restaurant or bar.
A fabric patterned with squares: a dress of pale green check.
A pattern of small squares, as on a chessboard.
phrasal-verb
Check in To register, as at a hotel.
Check out To record and total up the prices of and receive payment for (items being purchased) at a retail store: The cashier checked out and bagged my order.
Check out To withdraw (an item) after recording the withdrawal: check out books.
interjection
Informal Used to express agreement or understanding.
verb-intransitive
Sports To block or impede an opposing player in possession of the puck in ice hockey.
To abandon the proper game and follow baser prey. Used of trained falcons.
To agree point for point; correspond: The fingerprints checked with the ones on file.
To come to an abrupt halt; stop.
To make an examination or investigation; inquire: phoned to check on the departure time; checked into the rumor.
verb-transitive
To arrest the motion of abruptly; halt: checked the flow by shutting a valve.
To consign (luggage, for example) for shipment on a transportation vehicle: checked her bags and boarded the plane.
To deposit for temporary safekeeping: checked his coat at the door.
To hold in restraint; curb: check an impulse to laugh. See Synonyms at restrain.
To inspect so as to determine accuracy, quality, or other condition; test: checked the brakes and lights for defects; checked out the system to make sure there were no errors in the software.
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