The phrase "theatre of war" is commonly used to describe an area of conflict or military operations. However, there are several other synonyms that can be used in place of this phrase depending on the context. For instance, "battlefield" connotes a place where a combat operation is taking place. "Warzone" is another alternative that describes an area of intense conflict. "Combat zone" and "front line" are also commonly used as synonyms for "theatre of war." In addition, "conflict area" is a broader term that can be used to describe an area of conflict that is not limited to military operations, such as political or social unrest.