There are a number of synonyms for the term "hydro-foil". Some of the most common include "foil-assisted boat", "hydrofoil boat", "wing-in-ground-effect boat", and "WIG craft". These terms are generally used to describe a type of vessel that uses wing-like structures to lift the hull out of the water, allowing it to travel faster and more efficiently. Hydrofoils are often used in water sports, such as surfing and windsurfing, as well as in commercial and military applications. Overall, the term "hydro-foil" is just one way to describe this innovative type of watercraft.