geographic region vs Big Bend

geographic region and Big Bend both are nouns.

Word	Noun	Adjective	Verb	Adverb
geographic region	Yes	No	No	No
Big Bend	Yes	No	No	No

geographic region (noun)	Big Bend (noun)
a demarcated area of the Earth	a triangular area in southwestern Texas on the Mexican border; formed by a bend in the Rio Grande