MO vs USA

MO and USA both are nouns.

Word	Noun	Adjective	Verb	Adverb
MO	Yes	No	No	No
USA	Yes	No	No	No

MO (noun)	USA (noun)
a midwestern state in central United States; a border state during the American Civil War, Missouri was admitted to the Confederacy without actually seceding from the Union	the army of the United States of America; the agency that organizes and trains soldiers for land warfare
	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