It's the wind speed, or, if the direction is included, the wind velocity.
This is way to vague and confusing. Please rephrase and resubmit. Be more specific.
The swiftness of the horse was very unsually. The young fighter fought with the swiftness of a professional fighter.
Matilda was running with so much swiftness, I couldn't see her at all!
a cheetah
mercury
rapidity of motion; swiftness
A boot.
The phrase "That horse runs as fast as the wind" is an example of a simile, which is a figure of speech that compares two different things using "like" or "as." In this case, the speed of the horse is being compared to the wind to emphasize its swiftness. This comparison creates a vivid image for the reader, illustrating the horse's remarkable speed.
The abstract noun for the adjective swift is swiftness.
The conversion of wind energy into a useful form of energy is called the WIND... ENERGY. Have to add the ellipsis for it to work.
It means quickness, swiftness.
Foxes are known for there swiftness and sneakiness