geographic area vs East Coast of the United States

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

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

geographic area (noun)	East Coast of the United States (noun)
a demarcated area of the Earth	the eastern seaboard of the United States (especially the strip between Boston and Washington D.C.)