Rio Bravo vs U.S.

Rio Bravo and U.S. both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rio Bravo	Yes	No	No	No
U.S.	Yes	No	No	No

Rio Bravo (noun)	U.S. (noun)
a North American river; boundary between the United States and Mexico; flows into Gulf of Mexico	the executive and legislative and judicial branches of the federal government of the United States
	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