The word "grew rapidly" can be replaced with several different synonyms to add variety to your writing. Some of the best alternatives include "flourished," "boomed," "blossomed," "soared," and "prospered." Each of these words adds a slightly different connotation, but they all convey the idea of significant growth and progress over a short period of time. Whether you are describing a business, a community, or an individual, it can be helpful to mix up your language and use different synonyms to keep your writing fresh and engaging. So the next time you want to write about something that grew quickly, reach for one of these powerful synonyms to add some extra impact.