urban center vs Ilium

urban center and Ilium both are nouns.

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

urban center (noun)	Ilium (noun)
a large and densely populated urban area; may include several independent administrative districts	an ancient city in Asia Minor that was the site of the Trojan War