Madras vs urban center

Madras and urban center both are nouns.

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

Madras (noun)	urban center (noun)
a city in Tamil Nadu on the Bay of Bengal; formerly Madras	a large and densely populated urban area; may include several independent administrative districts
a state in southeastern India on the Bay of Bengal (south of Andhra Pradesh); formerly Madras