Urbanization is a term used to describe the process of cities and towns becoming more populous. There are several synonyms for the word "urbanizing" that might be useful when trying to convey this concept. Some of these words include "metropolitanizing," "municipalizing," "citifying," "industrializing," and "developing." These words all carry slightly different connotations and can be used to describe different aspects of urbanization. For example, "metropolitanizing" might be used to describe the growth of a city's population, while "industrializing" might refer to the development of new industries and businesses in the city. Ultimately, the choice of synonym will depend on the context in which it is being used and what aspect of urbanization is being emphasized.