geographic area vs West Coast of the United States

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

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

geographic area (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