Racer (noun)

1. A person or animal that runs fast.
2. A vehicle specifically designed for speed and racing.
3. A person who participates in races as a profession or hobby.

Origin:

The word "racer" is derived from the middle english word "rasour" meaning "runner". it was used to describe a person or animal that runs fast, and later, it was used to describe a vehicle specifically designed for speed and racing.

Examples:

1. He was a fast runner and a good racer.
2. She was a professional racer who competed in car races.
3. The grayhound is a breed of dog that is a good racer.
4. The car was a high-performance racer.
5. She was a recreational racer who participated in marathons.