Yes, ply is playable
...and is worth 9 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Ply" Definition
noun
A layer of rubber-coated fabric, often of nylon or polyester cords, forming the body of an automobile tire.
A layer, as of doubled-over cloth or of paperboard.
One of the sheets of wood glued together to form plywood.
One of the strands twisted together to make yarn, rope, or thread. Often used in combination: three-ply cord.
verb-intransitive
Nautical To work against the wind by a zigzag course; tack.
To traverse a route or course regularly: The boat plies between the islands on a weekly schedule.
verb-transitive
To continue offering something to; ensure that (another) is abundantly served: plied their guests with excellent food.
To double over (cloth, for example).
To join together, as by molding or twisting.
To traverse or sail over regularly: Trading ships plied the routes between coastal ports.
verb
To use or wield diligently.
To practice or perform diligently.
To keep furnishing or supplying something to.
To make a practice of rowing or sailing over or on.
To go or travel regularly over, on, or through.
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