The term "fourway flasher" refers to a piece of equipment that is used on vehicles to indicate emergency or danger. However, there are several other terms used to describe this equipment, including hazard lights, emergency flashers, signal lights, and warning lights. Regardless of the term used, the purpose of this equipment remains the same - to alert other drivers of potential danger on the road. With these synonyms, it's easy to communicate the need to use emergency lights in order to prevent accidents and keep everyone on the road safe.