Louisiana Purchase vs USA

Louisiana Purchase and USA both are nouns.

Word	Noun	Adjective	Verb	Adverb
Louisiana Purchase	Yes	No	No	No
USA	Yes	No	No	No

Louisiana Purchase (noun)	USA (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 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