* Chestnut as a color: Chestnut is a basic horse coat color that ranges from a light golden to a dark reddish brown. It's characterized by a solid body color and a black mane and tail.
* Chestnut as a breed: The Chestnut Horse is a rare breed of horse that originated in the United States. They are known for their chestnut coat color, their versatility in various disciplines, and their gentle temperament.
So, depending on the context, "chestnut" can refer to either a coat color or a specific breed of horse.