ravine
Pass
ravine
Try to find pictures of canyons on the web. Basically a canyon is a steep-sided valley. The word is used principally in North America.
The pronunciation of "cwm" is like "koom." It is a Welsh word for a small, steep-sided, circular basin or valley.
Hole, well, chasm, crack, crater, pit.
That would be CANYON.
A "fissure" is a crack or break in something. You might use the word "fissure' to describe a steep-sided canyon, something that looks like a crack in the mountain. You would not use "fissure" to describe the mountain itself.
A precipice is a steep cliff.
The word you're looking for is.... oblong. An alternative word for a rectangle.
Deep valley or creek with steep, narrow edges. Often a dangerous one that relates to death or the brink of death.
No, it is an adjective."Steep" is usually an adjective, or word used to describe a noun. For example, if you say, "That was a steep cliff," then "steep" describes the "cliff." A noun is a word used to describe a person, place, or thing. However, there are cases when you can use the word steep as a noun, in which case it means a steep slope.
The word "ravine" is a noun. It refers to a deep, narrow valley with steep sides typically carved by running water.