United States of America vs Colorado

United States of America and Colorado both are nouns.

Word	Noun	Adjective	Verb	Adverb
United States of America	Yes	No	No	No
Colorado	Yes	No	No	No

United States of America (noun)	Colorado (noun)
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 state in west central United States in the Rocky Mountains
	an important river in the southwestern United States; rises in the Rocky Mountains of northern Colorado and flows southwest through Utah into Arizona (where it flows through the Grand Canyon) and then southward through the southern tip of Nevada, then forming the border between California and Arizona and finally into Mexico where it empties into the Gulf of California; the main source of water in the southwestern United States
	a river in Texas; flows southeast into the Gulf of Mexico