A slope or inclination of the earth, as the side of a hill, considered as ascending, in opposition to declivity, or descending; an upward slope; ascent.
hummock
noun
A small hill; a hillock; a knoll.
A fistful.
A ridge or hill of ice in an ice field.
How often have the words acclivity and hummock occurred in a corpus of books? (source: Google Ngram Viewer )