bluff
cliff
crag
crest
escarpment
face
hilltop
knoll
lofty peak
mountaintop
palisade
palisades
peak
pic
pico
pike
pinnacle
point
scar
scarp
spur
steep
summit
tor
wall
drop
drop-off
precipitous
precipitously
precipitousness
abyss
ascent
boulder
cataract
cavern
chasm
glacier
glen
headland
hillside
ledge
plateau
rampart
ravine
waterfall