Greek capital vs Athenian

Greek capital and Athenian both are nouns.

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

Greek capital (noun)	Athenian (noun)
the capital and largest city of Greece; named after Athena (its patron goddess)	a resident of Athens

Greek capital (adjective)	Athenian (adjective)
	of or relating to or characteristic of Athens or its inhabitants