urban center vs Colossae

urban center and Colossae both are nouns.

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

urban center (noun)	Colossae (noun)
a large and densely populated urban area; may include several independent administrative districts	an ancient city in south western Phrygia in Asia Minor; site of an early Christian Church