geographical region vs Dakota

geographical region and Dakota both are nouns.

Word	Noun	Adjective	Verb	Adverb
geographical region	Yes	No	No	No
Dakota	Yes	No	No	No

geographical region (noun)	Dakota (noun)
a demarcated area of the Earth	the Siouan language spoken by the Dakota
	the area of the states of North Dakota and South Dakota
	a member of the Siouan people of the northern Mississippi valley; commonly called the Sioux