The word that describes the motion of an object as it spins in space is rotation.

Here are some other words that are related to spinning motion:

* Revolution: This refers to the movement of an object around another object, like the Earth revolving around the Sun.

* Spin: This is a more general term for rotation, often used in everyday language.

* Precession: This describes the slow change in the direction of an object's axis of rotation.

* Nutation: This describes a slight wobble in an object's rotation.

Let me know if you have any other questions!