geographical region vs Bluegrass Region

geographical region and Bluegrass Region both are nouns.

Word	Noun	Adjective	Verb	Adverb
geographical region	Yes	No	No	No
Bluegrass Region	Yes	No	No	No

geographical region (noun)	Bluegrass Region (noun)
a demarcated area of the Earth	an area in central Kentucky noted for its bluegrass and thoroughbred horses