Pacific Northwest vs U.S.A.

Pacific Northwest and U.S.A. both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pacific Northwest	Yes	No	No	No
U.S.A.	Yes	No	No	No

Pacific Northwest (noun)	U.S.A. (noun)
a region of the northwestern United States usually including Washington and Oregon and sometimes southwestern British Columbia	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