Caspian Sea vs Persia

Caspian Sea and Persia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Caspian Sea	Yes	No	No	No
Persia	Yes	No	No	No

Caspian Sea (noun)	Persia (noun)
a large saltwater lake between Iran and Russia fed by the Volga River; the largest inland body of water in the world	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