Bluegrass Region vs geographic region

Bluegrass Region and geographic region both are nouns.

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

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