Pennsylvania vs USA

Pennsylvania and USA both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pennsylvania	Yes	No	No	No
USA	Yes	No	No	No

Pennsylvania (noun)	USA (noun)
a university in Philadelphia, Pennsylvania	the army of the United States of America; the agency that organizes and trains soldiers for land warfare
a Mid-Atlantic state; one of the original 13 colonies, with capital Harrisburg	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
one of the British colonies that formed the United States, with capital Philadelphia