Yes, boom 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)
"Boom" Definition
noun
A barrier composed of a chain of floating logs enclosing other free-floating logs, typically used to catch floating debris or to obstruct passage.
A deep resonant sound, as of an explosion.
A floating barrier serving to contain an oil spill.
A long hollow tube attached to a tanker aircraft, through which fuel flows to another aircraft being refueled in flight.
A long movable arm used to maneuver and support a microphone.
idiom
Drop To act suddenly and forcefully to repress a practice or reprimand an offender; crack down.
verb-transitive
To cause to grow or flourish; boost.
To move or position using a crane: "The renegade logs somehow escaped while . . . the logs were boomed up into the mile-long rafts that ply these channels” ( Jack Weatherford).
To utter or give forth with a deep, resonant sound: a field commander booming out orders.
verb-intransitive
To grow, develop, or progress rapidly; flourish: Business is booming.
To make a deep, resonant sound.
verb
To make a deep hollow sound.
To increase in importance, popularity, or esteem.
To experience a sudden rapid growth and expansion usually with an increase in prices.
To develop rapidly in population and importance.
To increase greatly in size or number.
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