Plateau
Part of speech: noun
Definition: A largely level expanse of land at a high elevation; tableland. A comparatively stable level in something that varies.
Part of speech: verb
Definition: Reach a stable level; level off.
Example sentence: In high school, I was probably 155 - I wanted to run fast and get a scholarship, so, it was drilled in me that if you lose weight, you'll run faster. So, I went on a diet - I did lose weight, but then I hit a plateau where I couldn't lose any more weight. So, I started throwing my food up, so I became bulimic.
Tableland
Part of speech: noun
Definition: A relatively flat region of terrain, particularly in reference to surrounding terrain.