Organization of Petroleum-Exporting Countries vs Persia

Organization of Petroleum-Exporting Countries and Persia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Organization of Petroleum-Exporting Countries	Yes	No	No	No
Persia	Yes	No	No	No

Organization of Petroleum-Exporting Countries (noun)	Persia (noun)
an organization of countries formed in 1961 to agree on a common policy for the production and sale of petroleum	a theocratic Islamic republic in the Middle East in western Asia; Iran was the core of the ancient empire that was known as Persia until 1935; rich in oil
	an empire in southern Asia created by Cyrus the Great in the 6th century BC and destroyed by Alexander the Great in the 4th century BC