Louisiana Purchase vs U.S.

Louisiana Purchase and U.S. both are nouns.

Word	Noun	Adjective	Verb	Adverb
Louisiana Purchase	Yes	No	No	No
U.S.	Yes	No	No	No

Louisiana Purchase (noun)	U.S. (noun)
territory in the western United States purchased from France in 1803 for $15 million; extends from the Mississippi River to the Rocky Mountains and from the Gulf of Mexico to Canada	the executive and legislative and judicial branches of the federal government of the United States
	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