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Best Answer: Tornado: A violently rotating column of air in contact with the ground or Water (WaterSpout) and extending from the base of a thunderstorm. Cyclone: An atmospheric closed circulation rotating counter-clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere. The term hurricane is used for Northern Hemisphere tropical cyclones east of the International Dateline to the Greenwich Meridian.
Cyclone/Hurricane/Typhoon are the same thing. Twister/Tornado are the same thing. The main difference between these two is their relative sizes. The former have a span that is typically of the order of a 1000 km, whereas the latter is more of the order of 100 km.