Colorado Plateau vs NM

Colorado Plateau and NM both are nouns.

Word	Noun	Adjective	Verb	Adverb
Colorado Plateau	Yes	No	No	No
NM	Yes	No	No	No

Colorado Plateau (noun)	NM (noun)
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	a state in southwestern United States on the Mexican border