geographical region vs Canadian Maritime Provinces

geographical region and Canadian Maritime Provinces both are nouns.

Word	Noun	Adjective	Verb	Adverb
geographical region	Yes	No	No	No
Canadian Maritime Provinces	Yes	No	No	No

geographical region (noun)	Canadian Maritime Provinces (noun)
a demarcated area of the Earth	the collective name for the Canadian provinces of New Brunswick and Nova Scotia and Prince Edward Island