Hyetometer is a scientific instrument designed to measure the amount of rainfall or precipitation that occurs in a given area over a certain period of time. Synonyms for hyetometer include pluviometer, rain gauge, and ombrometer. A pluviometer is a device that measures the amount of rainfall or precipitation in a given area, while a rain gauge is a type of hyetometer that measures the amount of rainfall within a specific time period. An ombrometer, on the other hand, is a specialized type of rainfall gauge that measures not only the amount of rainfall but also its intensity and duration. Overall, these synonyms for hyetometer are essential tools for scientists and meteorologists who study weather patterns and climate change.