Greece vs Greek capital

Greece and Greek capital both are nouns.

Word	Noun	Adjective	Verb	Adverb
Greece	Yes	No	No	No
Greek capital	Yes	No	No	No

Greece (noun)	Greek capital (noun)
a republic in southeastern Europe on the southern part of the Balkan peninsula; known for grapes and olives and olive oil	the capital and largest city of Greece; named after Athena (its patron goddess)
ancient Greece; a country of city-states (especially Athens and Sparta) that reached its peak in the fifth century BCE