geographical region vs East Coast of the United States

geographical region and East Coast of the United States both are nouns.

Word	Noun	Adjective	Verb	Adverb
geographical region	Yes	No	No	No
East Coast of the United States	Yes	No	No	No

geographical region (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.)