Hydroscope is a specialized tool commonly used in marine and underwater research. It is used for inspecting and studying underwater objects and environments such as aquatic plants, structures, and marine animals. It can also help with navigational purposes. Synonyms for the word hydroscope include hydro viewer, underwater telescope, and water scope. Other words related to hydroscope include submersible, underwater camera, and underwater drone. These tools are essential in studying marine life and ecosystems, measuring water quality, and inspecting ships and submarines without putting a human being at risk. Overall, these tools are important in the field of oceanography and marine science.