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Pronunciation varies by accent · noun
A major storm (weather phenomenon) capable of causing catastrophic damage..
The megastorm Sandy caused 13-foot storm surges in the city.
Use megastorm when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Megastorm means A major storm (weather phenomenon) capable of causing catastrophic damage..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
The megastorm Sandy caused 13-foot storm surges in the city.
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