Nouns:
* Hilltop: The summit of a hill.
* Hillside: The slope of a hill.
* Hillbilly: A person from a rural, mountainous area (often considered derogatory).
* Hillwalker: A person who hikes or walks in hilly areas.
* Hillclimb: A race up a hill.
Adjectives:
* Hill-shaped: Having the shape of a hill.
* Hill-free: Without hills or slopes.
Verbs:
* Hill-climb: To climb a hill.
* Hill-walk: To walk in hilly areas.
Other:
* Hill country: A region characterized by hills.
* Hill station: A town or resort situated in a hilly area.
* Downhill: Moving down a hill.
* Uphill: Moving upwards on a hill.