There is no particular term for the bottom of a tornado. The base of a tornado may be shrouded in a debris cloud.
The top part of a tornado is called "the top"
Like a hurricane, the middle of the tornado is called the Eye.
It is usually called a tornado shelter. It may be called a storm cellar if it is underground.
A tornado that has touched the ground is called a funnel cloud.
A tornado that spins the opposite direction from normal in its hemisphere is called an anticyclonic tornado.
A tornado's width is measured at bottom, usually by the width of the damage path.
This is called a tornado.
A tornado in the southern hemisphere is still called a tornado.
The cloud of condensation the a tornado produces is funnel-shaped, wider at the top than at the bottom.
Such a storm is called a tornado.
It is usually just called a debris cloud or dust whirl.
The process of a tornado forming is called tornado genesis. Usually a tornado is a funnel cloud before it touches down.
Objects inside a tornado are called debris.
A tornado is called a killer if it kills somebody.
its called the tornado tube
Like a hurricane, the middle of the tornado is called the Eye.
A tornado is called a waterspout anywhere that it forms on water.