USA vs East

USA and East both are nouns.

Word	Noun	Adjective	Verb	Adverb
USA	Yes	No	No	No
East	Yes	No	No	No

USA (noun)	East (noun)
the army of the United States of America; the agency that organizes and trains soldiers for land warfare	the countries of Asia
North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776	the region of the United States lying to the north of the Ohio River and to the east of the Mississippi River