U.S. vs Ohio River

U.S. and Ohio River both are nouns.

Word	Noun	Adjective	Verb	Adverb
U.S.	Yes	No	No	No
Ohio River	Yes	No	No	No

U.S. (noun)	Ohio River (noun)
the executive and legislative and judicial branches of the federal government of the United States	a river that is formed in western Pennsylvania and flows westward to become a tributary of the Mississippi River
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