urban center vs Saskatoon

urban center and Saskatoon both are nouns.

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

urban center (noun)	Saskatoon (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in central Saskatchewan; the largest city in the province