USA vs Missouri River

USA and Missouri River both are nouns.

Word	Noun	Adjective	Verb	Adverb
USA	Yes	No	No	No
Missouri River	Yes	No	No	No

USA (noun)	Missouri River (noun)
the army of the United States of America; the agency that organizes and trains soldiers for land warfare	the longest river in the United States; arises in Montana and flows southeastward to become a tributary of the Mississippi at Saint Louis
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