Yes, tap is playable
...and is worth 6 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Tap" Definition
noun
A makeshift terminal in an electric circuit.
A metal plate attached to the toe or heel of a shoe, as for tap-dancing.
A plug for a bunghole; a spigot.
A thin layer of leather or a substitute applied to a worn-down shoe heel or toe.
verb-intransitive
To deliver a gentle, light blow or blows.
To walk making light clicks.
verb
To let out or cause to flow by piercing or by drawing a plug from the containing vessel .
To pierce so as to let out or draw off a fluid .
To draw out, from, or upon .
To cut in on (as a telephone or radio signal) to get information.
To form an internal screw thread in by means of a tap.
verb-transitive
Informal To ask (a person) for money.
Medicine To withdraw fluid from (a body cavity).
To attach metal plates to (shoe toes or heels).
To cut screw threads in (a collar, socket, or other fitting).
To draw (liquid) from a vessel or container: tap a new keg of beer.
idiom
On tap Available for immediate use; ready: extra personnel on tap.
On tap Ready to be drawn; in a tapped cask: beer on tap.
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