Nilometers are a type of instrument used to measure the water level of the Nile River. However, there are several other terms that can be used to describe similar instruments used for measuring water levels in other bodies of water. These terms include gauges, meters, gauging stations, and hydrographs. Each of these terms refers to a different type of instrument or measurement technique, but they all serve the same basic purpose of measuring water levels. Whether referring to a nilometer or a gauge, these instruments are crucial for monitoring water levels and predicting flooding or drought conditions, particularly in areas prone to extreme weather events.