Hydraulic head refers to the pressure exerted by a fluid column in a given point. In hydrology, it is a significant term used to discuss groundwater flow and wells. Some synonyms for hydraulic head include piezometric head, groundwater level, water table, and hydraulic gradient. Piezometric head refers to the hydraulic head measured by a piezometer. The groundwater level is the height of the water surface above a point of reference. The water table is the plane where the soil or rock is saturated with water in an aquifer. Hydraulic gradient denotes the change in hydraulic head between two points in the flow direction. In summary, hydraulic head synonyms provide an opportunity to use different terms while communicating similar or related concepts.