Greece vs Grecian

Greece and Grecian both are nouns.

Word	Noun	Adjective	Verb	Adverb
Greece	Yes	No	No	No
Grecian	Yes	Yes	No	No

Greece (noun)	Grecian (noun)
a republic in southeastern Europe on the southern part of the Balkan peninsula; known for grapes and olives and olive oil	a native or resident of Greece
ancient Greece; a country of city-states (especially Athens and Sparta) that reached its peak in the fifth century BCE

Greece (adjective)	Grecian (adjective)
	of or relating to or characteristic of Greece or the Greeks or the Greek language