The mesopause, the boundary between the mesosphere and the thermosphere, is a term primarily used in atmospheric science. However, there are other words that can be used as synonyms to refer to this part of the atmosphere. These include the Stratopause, which is the boundary between the stratosphere and the mesosphere, and the Ionopause, which is the boundary between the ionosphere and the magnetosphere. Other potential synonyms might include the Outer Mesosphere, the Upper Mesosphere, or the Mesopause boundary itself. Regardless of the terminology used, understanding the characteristics and location of the mesopause is important to understanding the behavior of our atmosphere and the effects of climate change.