* Hillbilly: A person from a remote, rural area, especially in the Appalachian Mountains.
* Hilltop: The top of a hill.
* Hillside: The sloping side of a hill.
* Hillwalking: The activity of walking on hills.
* Hill station: A resort town situated in a hilly area.
* Hill climber: A person who climbs hills, often in a vehicle.
* Hill country: A region of hills and valleys.
* Hill range: A series of hills in a line.
* Hill fort: A fortified settlement on a hill.
* Hilltop view: A scenic view from the top of a hill.
Let me know if you'd like more examples!