mountain pass vs gorge

mountain pass and gorge both are nouns.

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

As nouns, gorge is a hyponym of mountain pass; that is, gorge is a word with a more specific, narrower meaning than mountain pass:

mountain pass: the location in a range of mountains of a geological formation that is lower than the surrounding peaks
gorge: a narrow pass (especially one between mountains)

Other hyponyms of mountain pass include col, gap, defile, saddle, saddleback.

mountain pass (noun)	gorge (noun)
the location in a range of mountains of a geological formation that is lower than the surrounding peaks	the passage between the pharynx and the stomach
	a deep ravine (usually with a river running through it)
	a narrow pass (especially one between mountains)

mountain pass (verb)	gorge (verb)
	overeat or eat immodestly; make a pig of oneself