East vs East Coast of the United States

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

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

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