the word cyclone specifically refers to a large weather system that rotates around a center of low atmospheric pressure counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere. Cyclones do not feature cloud funnels.

Funnel cloud

A tornado is not necessarily visible; however, the intense low pressure caused by the high wind speeds (as described by Bernoulli's principle) and rapid rotation (due to cyclostrophic balance)

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