There are numerous synonyms for the term "big school." Some of the common alternatives include "large school," "major school," "significant school," and "great school." Other synonyms include "mega-school," "grand school," "vast school," and "massive school." The term can also be replaced with "established school," "well-established school," or "popular school." Additionally, "prestigious school," "renowned school," and "prominent school" can be used as synonyms for the term. When describing a school that is larger than average in size, any of these synonyms can be used to create a more varied and descriptive vocabulary.