gorge vs Olduvai Gorge

gorge and Olduvai Gorge both are nouns.

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

gorge (noun)	Olduvai Gorge (noun)
the passage between the pharynx and the stomach	a gorge in northeastern Tanzania where anthropologists have found some of the earliest human remains
a deep ravine (usually with a river running through it)
a narrow pass (especially one between mountains)

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