Yes, tail is playable
...and is worth 5 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Tail" Definition
noun
A braid of hair; a pigtail.
A formal evening costume typically worn by men.
A train of followers; a retinue.
An appendage to the rear or bottom of a thing: the tail of a kite.
phrasal-verb
Off To diminish gradually; dwindle or subside: The fireworks tailed off into darkness.
Tail down To ease a heavy load down a steep slope.
verb
To remove the tail of (an animal) .
To remove the stem or bottom part of .
To make or furnish with a tail.
To follow or be drawn behind like a tail.
verb-intransitive
Architecture To be inserted at one end into a wall, as a floor timber or beam.
Informal To follow: tailed after the leader.
Nautical To go aground with the stern foremost.
Nautical To lie or swing with the stern in a named direction, as when riding at anchor or on a mooring.
Sports To veer from a straight course in the direction of the dominant hand of the player propelling the ball: a pitch that tails away from the batter.
verb-transitive
Architecture To set one end of (a beam, board, or brick) into a wall.
Informal To follow and keep under surveillance.
To connect (often dissimilar or incongruous objects) by or as if by the tail or end: tail two ideas together.
To deprive of a tail; dock.
To provide with a tail: tail a kite.
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