Persian Empire vs Asia

Persian Empire and Asia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Persian Empire	Yes	No	No	No
Asia	Yes	No	No	No

Persian Empire (noun)	Asia (noun)
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	the nations of the Asian continent collectively
	the largest continent with 60% of the earth's population; it is joined to Europe on the west to form Eurasia; it is the site of some of the world's earliest civilizations