U.S. vs CA

U.S. and CA both are nouns.

Word	Noun	Adjective	Verb	Adverb
U.S.	Yes	No	No	No
CA	Yes	No	No	No

U.S. (noun)	CA (noun)
the executive and legislative and judicial branches of the federal government of the United States	a state in the western United States on the Pacific; the 3rd largest state; known for earthquakes
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