Bluegrass Region vs geographical area

Bluegrass Region and geographical area both are nouns.

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

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