The prefix "metro-" refers to cities or urban areas, and there are several synonyms to describe this concept. One of the most common is "city," which implies a densely populated region with plenty of buildings, cultural attractions, and economic activity. Another synonym is "metropolis," a term that connotes a large and influential city with a distinct character and identity. Other synonyms for "metro-" include "urban," "cosmopolitan," "urbane," and "municipal." Each of these terms captures a different aspect of metropolises, including their sophistication, scale, density, and public services. Ultimately, whether you call it a city, metropolis, or urban area, the prefix "metro-" is a useful way to describe these bustling and diverse centers of human activity.