Miss. vs Mississippi

Miss. and Mississippi both are nouns.

Word	Noun	Adjective	Verb	Adverb
Miss.	Yes	No	No	No
Mississippi	Yes	No	No	No

As nouns, Miss. and Mississippi are synonyms defined as:

Miss. and Mississippi: a state in the Deep South on the gulf of Mexico; one of the Confederate States during the American Civil War

Other synonyms of Miss. include Magnolia State, MS.

Miss. (noun)	Mississippi (noun)
a state in the Deep South on the gulf of Mexico; one of the Confederate States during the American Civil War	a state in the Deep South on the gulf of Mexico; one of the Confederate States during the American Civil War
	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