Bluegrass Region vs geographical region

Bluegrass Region and geographical region both are nouns.

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

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