col vs mountain pass

col and mountain pass both are nouns.

Word	Noun	Adjective	Verb	Adverb
col	Yes	No	No	No
mountain pass	Yes	No	No	No

As nouns, mountain pass is a hypernym of col; that is, mountain pass is a word with a broader meaning than col:

col: a pass between mountain peaks; geomorphological term for the lowest point on a mountain ridge between two peaks
mountain pass: the location in a range of mountains of a geological formation that is lower than the surrounding peaks

Other hypernyms of col include notch, pass.

col (noun)	mountain pass (noun)
a pass between mountain peaks; geomorphological term for the lowest point on a mountain ridge between two peaks	the location in a range of mountains of a geological formation that is lower than the surrounding peaks