Hillock Synonyms: knoll, mound
Hillock Sentence: Horses were often seen grazing on a hillock near our house in the village.
Under The Lens: Difference between Hillock and Mound
Hillock refers to a natural elevation of earth which is small in comparison to hills and mountains. In other words hillock is a small natural hill.
Mound on the other hand usually refers to an artificial elevation of the earth although at times it can be used interchangeably with hillock.