USA vs Mo.

USA and Mo. both are nouns.

Word	Noun	Adjective	Verb	Adverb
USA	Yes	No	No	No
Mo.	Yes	No	No	No

USA (noun)	Mo. (noun)
the army of the United States of America; the agency that organizes and trains soldiers for land warfare	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
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