Seaplanes, also known as floatplanes, are aircraft that can take off and land on water. They are commonly used for recreational purposes and transportation in remote areas. Amphibious aircraft is another synonym for seaplanes, which describes planes that can operate on both land and water. Hydroplanes are another synonym for seaplanes, which emphasizes their ability to skim across the surface of the water with the help of hydrofoils. Flying boats are another type of seaplane that have an enclosed hull, allowing them to take off and land on water as well as land. Overall, these various synonyms highlight the versatility and uniqueness of seaplanes.