Yes, single is playable
...and is worth 10 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Single" Definition
noun
A phonograph record, especially a forty-five, having one song on each side.
A song on one of these sides.
A song, often from a full-length album or compact disk, that is released for airplay.
An accommodation for one person, as in a hotel.
verb-transitive
Baseball To cause (a base runner) to score or advance by making a one-base hit: singled him to second.
Baseball To cause the scoring of (a run) by a one-base hit.
To choose or distinguish from others. Often used with out: We singled her out from the list of applicants.
verb-intransitive
Baseball To make a single.
adjective
Botany Having only one rank or row of petals: a single flower.
Consisting of one in number: She had but a single thought, which was to escape.
Consisting of one part, aspect, or section: a single thickness; a single serving.
Designed to accommodate one person: a single bed.
Having individual opponents; involving two individuals only: single combat.
verb
To select or distinguish from a number or group .
To advance or score (a base runner) by a single.
To bring about the scoring of (a run) by a single.
To make a single in baseball.
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