Plasma accelerator refers to a device that accelerates ionized gas in order to produce high-energy beams. There are several synonyms for this term, including plasma buncher, plasma wakefield accelerator, and laser plasma accelerator. Plasma buncher uses varying electric fields to compress the ionized gas that, in turn, emits more intense radiation. Plasma wakefield accelerator employs the wake that is generated by a high-speed charged particle moving through the plasma. Laser plasma accelerator produces accelerating gradients by using the plasma wave that is created by a powerful laser. Each of these synonyms implies a method or technology that is closely related to plasma acceleration and its effects, which is to create highly energetic particles through the use of plasma.