There are several synonyms for the word "watercannon" that are commonly used by law enforcement and riot control teams. One such synonym is "water jet," which refers to a high-pressure stream of water used to disperse crowds or put out fires. Another common synonym is "water hose," which refers to a long, flexible tube that delivers a steady stream of water to quell disturbances. A related synonym is "water sprayer," which refers to a handheld device that emits a fine mist of water to cool down overheated crowds. Finally, "fire hose" may also be used as a synonym for "water cannon," particularly in situations where the device is being used to extinguish flames.