U.S.A. vs Pacific Northwest

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

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

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