Yes, top 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)
"Top" Definition
noun
A garment worn on the upper half of the body, especially a sweater or knit shirt.
A person in this position.
A toy having one end tapered to a point, allowing it to be spun, as by suddenly pulling a string wound around it.
Baseball The first half of an inning.
Games The highest card or cards in a suit or hand.
adjective
In a position of preeminence: the top historian in her department.
Of the highest degree, quality, rank, or amount: in top form; the top ten bestsellers.
Situated at the top: the top shelf.
Of, relating to, or being at the top .
Of the highest quality, amount, or degree .
idiom
On top At the highest point or peak.
On top In a dominant, controlling, or successful position.
On top of Informal Following closely on; coming immediately after: Hail came on top of a violent thunderstorm.
On top of Informal Fully informed about: a senator who is always on top of the issues.
On top of Informal In addition to; besides: On top of this, several other benefits are being offered.
verb-transitive
Sports To make (a stroke) in this way.
Sports To strike the upper part of (a ball), giving it forward spin.
To be at the head of: She topped her class.
To form, furnish with, or serve as a top.
verb-intransitive
To make a finish, an end, or a conclusion.
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