geographic region vs West Coast of the United States

geographic region and West Coast of the United States both are nouns.

Word	Noun	Adjective	Verb	Adverb
geographic region	Yes	No	No	No
West Coast of the United States	Yes	No	No	No

geographic region (noun)	West Coast of the United States (noun)
a demarcated area of the Earth	the western seaboard of the United States from Washington to southern California