Yes, plug is playable
...and is worth 11 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Plug" Definition
noun
A dense mass of material that obstructs a passage.
A flat cake of pressed or twisted tobacco.
A lure to which hooks are attached, used especially in angling.
A piece of chewing tobacco.
verb-transitive
Informal To publicize (a product, for example) favorably, as by mentioning on a broadcast: authors who plug their latest books on TV talk shows.
Slang To hit with a bullet; shoot.
Slang To hit with the fist; punch.
To fill (a hole) tightly with or as if with a plug; stop up.
To insert (something) as a plug: plugged a cork in the bottle.
verb-intransitive
Informal To work doggedly and persistently: "You may plug along fifty years before you get anywhere” ( Saul Bellow).
To become stopped up or obstructed: a gutter that plugged up with leaves.
phrasal-verb
Plug in To connect (an appliance) to an electrical outlet.
Plug in To function by being connected to an electrical outlet: a power drill that plugs in.
Plug into Slang To cause to be closely attuned or responsive to: connoisseurs who are plugged into the current art scene.
Plug into To connect or be connected to in the manner of an electrical appliance: The local system is plugged into the national telephone network. This computer plugs into a data bank.
verb
To stop, make tight, or secure by inserting a plug.
To remedy (a deficiency) as if by inserting a plug.
To advertise or publicize insistently.
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