East Coast of the United States vs East

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

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

East Coast of the United States (noun)	East (noun)
the eastern seaboard of the United States (especially the strip between Boston and Washington D.C.)	the countries of Asia
	the region of the United States lying to the north of the Ohio River and to the east of the Mississippi River