Grand Canyon vs Colorado Plateau

Grand Canyon and Colorado Plateau both are nouns.

Word	Noun	Adjective	Verb	Adverb
Grand Canyon	Yes	No	No	No
Colorado Plateau	Yes	No	No	No

Grand Canyon (noun)	Colorado Plateau (noun)
the enormous gorge of the Colorado River in northern Arizona	a large plateau to the south and west of the Rocky Mountains; abuts mountains on the north and east and ends in an escarpment overlooking lowlands to the south and west; the Grand Canyon is carved out of the southwestern corner