However, depending on the context, you could use:
Similar meanings, but not precise synonyms:
* Speed: This refers only to the magnitude of velocity, not direction.
* Motion: This is a general term for movement, but doesn't specify speed or direction.
* Rate: This can be used to describe the speed of change, but not necessarily direction.
* Momentum: This describes the mass in motion, incorporating both speed and direction.
More specific synonyms:
* Speed: If you only care about how fast something is moving, "speed" is appropriate.
* Flow: This can be used to describe the movement of fluids, like air or water.
* Drift: This implies a slow, gentle movement.
The best alternative will depend on the specific situation and what you want to emphasize.