Which term would you use to describe the spinning of Earths on its axis?

Rotation or Rotating.

If you stand at either the North Pole or the South Pole , you just twist/rotate on the spot.

However, if you are at the Eqautor you are rotating at about 1,000 miles per hour.

At latitudes 60N & 60 S your rotational speed is about 500 miles per hour.