urban center vs Mycenae

urban center and Mycenae both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Mycenae	Yes	No	No	No

urban center (noun)	Mycenae (noun)
a large and densely populated urban area; may include several independent administrative districts	an ancient city is southern Greece; center of the Mycenaean civilization during the late Bronze Age