Other forms: hillocks
A hillock is a small mound of land that's often nearby a group of taller hills. Small children can rarely resist rolling down a grassy hillock.
The word hillock was formed by adding the Old English diminutive -oc to hill, meaning "little hill." You can also call this small, ridged slope of land a knoll. You might sit in the shade of a hillock to eat your picnic lunch, or watch your dog scampering up and down hillocks covered in wildflowers. While you may get out of breath running up a hill, you'll scale a hillock with no problem.