The word "douser" is typically used to describe a device or tool used to extinguish flames with water. However, there are several synonyms that can be used in place of "douser", each with their own unique connotations. For example, the word "extinguisher" is often used in place of "douser" in the context of fire safety. Another synonym is "sprinkler", which is commonly used in the context of fire suppression systems in buildings. "Hydrant" is also a synonym for "douser", particularly in the context of accessing water for firefighting purposes. In general, these synonyms all refer to tools or systems used to put out fires and prevent them from spreading.