Yes, drone is playable
...and is worth 7 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Drone" Definition
noun
A continuous low humming or buzzing sound.
A male bee, especially a honeybee, that is characteristically stingless, performs no work, and produces no honey. Its only function is to mate with the queen bee.
A person who does tedious or menial work; a drudge: "undervalued drones who labored in obscurity” ( Caroline Bates).
A pilotless aircraft operated by remote control.
An idle person who lives off others; a loafer.
verb-intransitive
To make a continuous low dull humming sound: "Somewhere an electric fan droned without end” ( William Styron).
To pass or act in a monotonous way.
To speak in a monotonous tone: The lecturer droned on for hours.
verb-transitive
To utter in a monotonous low tone: "The mosquitoes droned their angry chant” ( W. Somerset Maugham).
verb
To make a sustained deep murmuring, humming, or buzzing sound .
To talk in a persistently dull or monotonous tone .
To pass, proceed, or act in a dull, drowsy, or indifferent manner .
To utter or pronounce with a drone.
To pass or spend in dull or monotonous activity or in idleness.
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