Yes, drop is playable
...and is worth 8 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Drop" Definition
noun
A central place or establishment where something, such as mail, is brought and subsequently distributed.
A predetermined location for the deposit and subsequent removal of secret communications or illicit goods, such as drugs.
A sheer incline, such as the face of a cliff.
idiom
At the drop of a hat Immediately; without delay: would sign the contract at the drop of a hat.
At the drop of a hat With only the slightest provocation: ready to argue at the drop of a hat.
Drop a dime Slang To make a telephone call, especially to the police to inform on or betray someone.
Drop in the bucket A small, inadequate quantity.
Get To achieve a distinct advantage over.
phrasal-verb
Drop back Football To back away from the line of scrimmage.
Drop behind To fall behind: dropped behind the rest of the class during her illness.
Drop by To stop in for a short visit.
Drop off To decrease: Sales dropped off in the fourth quarter.
verb-transitive
Informal To spend, especially lavishly or rashly: "dropping $50,000 in an Atlantic City casino” ( George F. Will).
Slang To take, as a drug, by mouth: drop acid.
Sports To hurl or strike (a ball) into a basket or hole.
To cause to become less; reduce: drop the rate of production.
To cause to fall, as by hitting or shooting.
verb-intransitive
Sports To fall or roll into a basket or hole. Used of a ball.
To become less, as in number, intensity, or volume.
To descend from one level to another.
To fall from a higher to a lower place or position.
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