Lampreys are a type of jawless fish that belong to the order Petromyzontiformes. They are often referred to as "eel-like" due to their similar appearance, but they are actually a distinct group of aquatic animals. Some synonyms for lampreys include: brook lamprey, river lamprey, sea lamprey, chestnut lamprey, and paper lamprey. These different species of lampreys can be found in various freshwater and saltwater environments around the world. While lampreys may not be as well-known as other fish species, they play an important role in many aquatic ecosystems as both predators and prey.