a butte or a mesa.
We apply the term mesa to a flat-topped mountain.
plateau
Butte
Mesas are broad flat-topped landforms with steep sides. They are commonly found in arid regions and are formed by erosion of sedimentary rocks.
Yellowstone national park
plateau
A mesa is a flat-topped landform with steep sides, while a mountain is a higher landform that rises steeply from its surroundings. Mesas are usually smaller and have a more distinct flat top compared to mountains.
A mesa is a flat-topped hill or small plateau with steep sides. -Erin R. A broad, flat-topped elevation with one or more clifflike sides, common in the southwest United States - Mhluo
applacation mountains
A Mesa is an elevated piece of land with a flat top and steep sides. A Mountain has a similar description, but climbs to a peak
What is a "butte"? A butte is a flat-topped hill or mountain with steep sides, formed by the erosion of surrounding rock by wind and water. The resistant rock on top of the butte protects the softer rock underneath, resulting in the characteristic flat summit and steep cliffs.
A mesa.