There are several synonyms that can be used for the phrase "running water". Some of the commonly used ones include flowing water, rushing water, streaming water, and flowing liquid. These synonyms are applicable in different situations and contexts. For instance, rushing water can be used to describe the sound and speed of water in a river, while streaming water may be used to describe a steady and continuous flow of water. Flowing liquid, on the other hand, can be used to describe the movement of water in pipes and drainage systems. Overall, the synonyms for running water provide diversity and help to give a clearer picture of the movement and sound of water.