Are all rotations tornadoes

No. A tornado is defined as a violently rotating column of air extending from the based of a thunderstorm to the ground. In order to be considered a tornado the circulation must:

1. Be composed primarily of air (as opposed to water or some other fluid)
2. Be associated with a parent thunderstorm.
3. Be in contact with both cloud base and the ground.
4. Produce winds at ground level strong enough to cause damage.

Because of this, a number of atmospheric circulations are not considered tornadoes.