boom

noun

1
any of various more-or-less horizontal spars or poles used to extend the foot of a sail or for handling cargo or in mooring
2
a pole carrying an overhead microphone projected over a film or tv set
3
a deep prolonged loud noise
4
a sudden happening that brings good fortune (as a sudden opportunity to make money)
the demand for testing has created a boom for those unregulated laboratories where boxes of specimen jars are processed like an assembly line
5
a state of economic prosperity

1
grow vigorously
The deer population in this town is thriving
business is booming
2
hit hard
He smashed a 3-run homer
3
make a deep hollow sound
Her voice booms out the words of the song
4
make a resonant sound, like artillery
His deep voice boomed through the hall
5
be the case that thunder is being heard
Whenever it thunders, my dog crawls under the bed

Also useful for “boom”:Unscrambler— Turn loose letters into real words