Manhattan Island is only part of the metropolitan area of New York City.
Superman's secret identity is Clark Kent, described as a "mild-mannered reporter for a great metropolitan newspaper" (the Daily Planet).
The word metropolitan is an adjective in this sentence.
New York is a very metropolitan area.
In the sentence "our new neighbors moved here from a large metropolitan area," the word "metropolitan" functions as an adjective. It describes the noun "area," indicating the type or nature of the area from which the neighbors moved.
There is an art exhibition tonight at the Metropolitan Museum.
The large metropolitan area has a diverse, multicultural population.
Let's move away from this metropolitan area and into the forest.
metro
Yes, "Metropolitan" should be capitalized when used in a sentence if it is part of a proper noun or name, such as "Metropolitan Museum of Art" or "Metropolitan Opera." However, if used as a general adjective to describe a metropolitan area or city, it should not be capitalized, as in "the metropolitan area of New York City."
town, metropolitan, municipal, nonrural
Metropolitan or metropolis, Metronome, Metrorrhagia.
The metropolitan streets of New York City are usually filled with people.In The Adventures of Superman, the Daily Planet was described as a great metropolitan newspaper.
urban, city, metropolitan