There are several synonyms for the term "main building". Some common alternatives include "central edifice", "primary structure", "core establishment", "principal infrastructure", and "primary complex". These descriptors all carry different connotations and shades of meaning. For instance, "central edifice" suggests that the building is the hub or focal point of a larger structure or campus, while "primary structure" simply indicates that it is the most important building within a collection of structures. "Core establishment" implies that the building is the heart or backbone of a particular enterprise or organization. Whatever term is used, it is clear that the main building serves as a key component of many different types of structures and institutions.