city limits vs town

city limits and town both are nouns.

Word	Noun	Adjective	Verb	Adverb
city limits	Yes	No	No	No
town	Yes	No	No	No

city limits (noun)	town (noun)
the limits of the area occupied by a city or town	the people living in a municipality smaller than a city
	an urban area with a fixed boundary that is smaller than a city
	an administrative division of a county