Refers to a single hill or small elevation, often in geographical or descriptive contexts.
There is a small shrine on top of that hill.
rolling hills; foothills
Often used in the plural or as a collective term for an area of low, undulating hills, especially at the base of mountains.
This area is a region of gentle rolling hills.
Lush green hills stretch out across this region.
The travelers crossed several hills before reaching the village.
The town is surrounded by beautiful hills.