boom - noun

a deep prolonged loud noise

a state of economic prosperity

a sudden happening that brings good fortune (as a sudden opportunity to make money)

a pole carrying an overhead microphone projected over a film or tv set

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

boom - verb

• make a resonant sound, like artillery
• hit hard
• be the case that thunder is being heard
• make a deep hollow sound
• grow vigorously

boom - thesaurus

blast   bonanza   bunce   din   expand   flourish   godsend   gravy   nail   roar   roaring   smash   thrive   thunder   windfall