Knoll, Hillock, Barrow (British)
small and rounded hill
Downs
Rolling grassy upland with few trees
Plateau
Extensive flat-topped land elevation that rises steeply on at least one side.
Mesa, Butte
Isolated steep hill or small mountain
Pike, Peak, Summit
Top of a mountain
Glacial horn, Horn of the Mountain, Pyramidal peak
An angular sharply pointed mountain peak which results from the cirque erosion due to multiple glaciers diverging from a central point
Aerie, Eyrie
Elevated place
Palisade, Palisades
Cliff formation or line of cliffs
Deli, Glen
Small and nestled (Usually wooded) valley
Hollow, Combe
Deep and narrow valley
Vale, dale
Valley
Scree
Rocky debris on a mountain slope
Furmarole
Volcanic vapor hole
Maar
Extinct volcano crater often containing a lake or marsh