Main Difference
The main difference between Hill and Mountain is that the Hill is a landform that extends above the surrounding terrain and Mountain is a large landform that stretches above the surrounding land.
Hill
A hill is a landform that extends above the surrounding terrain. It often has a distinct summit, although in areas with scarp/dip topography a hill may refer to a particular section of flat terrain without a massive summit (e.g. Box Hill, Surrey).
Mountain
A mountain is a large landform that stretches above the surrounding land in a limited area, usually in the form of a peak. A mountain is generally steeper than a hill. Mountains are formed through tectonic forces or volcanism. These forces can locally raise the surface of the earth. Mountains erode slowly through the action of rivers, weather conditions, and glaciers. A few mountains are isolated summits, but most occur in huge mountain ranges.
High elevations on mountains produce colder climates than at sea level. These colder climates strongly affect the ecosystems of mountains: different elevations have different plants and animals. Because of the less hospitable terrain and climate, mountains tend to be used less for agriculture and more for resource extraction and recreation, such as mountain climbing.
The highest mountain on Earth is Mount Everest in the Himalayas of Asia, whose summit is 8,850 m (29,035 ft) above mean sea level. The highest known mountain on any planet in the Solar System is Olympus Mons on Mars at 21,171 m (69,459 ft).
Hill (noun)
An elevated location smaller than a mountain.
“The park is sheltered from the wind by a hill to the east.”
Hill (noun)
A sloping road.
“You need to pick up speed to get up the hill that’s coming up.”
Hill (noun)
A heap of earth surrounding a plant.
Hill (noun)
A single cluster or group of plants growing close together, and having the earth heaped up about them.
“a hill of corn or potatoes”
Hill (noun)
The pitcher’s mound.
Hill (verb)
To form into a heap or mound.
Hill (verb)
To heap or draw earth around plants.
Mountain (noun)
A large mass of earth and rock, rising above the common level of the earth or adjacent land, usually given by geographers as above 1000 feet in height (or 304.8 metres), though such masses may still be described as hills in comparison with larger mountains.
“Everest is the highest mountain in the world.”
“We spent the weekend hiking in the mountains.”
Mountain (noun)
A large amount.
“There’s still a mountain of work to do.”
Mountain (noun)
A very large person or thing.
“He was a real mountain of a man, standing seven feet tall.”
Mountain (noun)
A difficult task or challenge.
Mountain (noun)
A woman’s large breast.
Mountain (noun)
The twenty-first Lenormand card.