Philip Marlowe vs USA

Philip Marlowe and USA both are nouns.

Word	Noun	Adjective	Verb	Adverb
Philip Marlowe	Yes	No	No	No
USA	Yes	No	No	No

Philip Marlowe (noun)	USA (noun)
tough cynical detective (one of the early detective heroes in American fiction) created by Raymond Chandler	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