Olduvai Gorge vs gorge

Olduvai Gorge and gorge both are nouns.

Word	Noun	Adjective	Verb	Adverb
Olduvai Gorge	Yes	No	No	No
gorge	Yes	No	Yes	No

Olduvai Gorge (noun)	gorge (noun)
a gorge in northeastern Tanzania where anthropologists have found some of the earliest human remains	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)

Olduvai Gorge (verb)	gorge (verb)
	overeat or eat immodestly; make a pig of oneself