Mississippi vs US

Mississippi and US both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mississippi	Yes	No	No	No
US	Yes	No	No	No

Mississippi (noun)	US (noun)
a state in the Deep South on the gulf of Mexico; one of the Confederate States during the American Civil War	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 major North American river and the chief river of the United States; rises in northern Minnesota and flows southward into the Gulf of Mexico