If you're a writer or a publisher, chances are you've heard of the term "best seller". It's a term used to describe a book that has sold a significant number of copies and received positive reviews from readers. However, there are several other words you can use to describe a book that's selling well. Some of these words include "chart-topper", "blockbuster", "hit", "smash", and "top-seller". Each of these words has a slightly different connotation, so it's important to choose the one that's most appropriate for your context. Whether you're writing a book review or marketing a new release, having a range of synonyms for "best seller" at your disposal can help you keep your language fresh and engaging.