City: A city is an urban settlement that usually serves as the center of government, commerce, culture, and other important activities.
Metropolis: A metropolis is a large and highly populated city or urban area that serves as the core of economic activity within its region.
Suburb: A suburb is an outlying residential area located on the outskirts of a city or town. It typically offers housing options for people who commute to the nearby urban center for work or other activities.