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boom has 19 distinct synonyms spread across 8 of its 10 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
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”
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
Synonyms, antonyms and the broader and narrower relations for boom come from Princeton University’s WordNet. Full sources and licences.
be the case that thunder is being heard
“Whenever it thunders, my dog crawls under the bed”