There are many synonyms for the term "spelling checker." Some of the most common ones are the "spell-checker," "speller," "proofreader," "grammar checker," and "auto-correct." All of these terms refer to software or tools that help writers or speakers check their spelling and grammar to ensure that their writing is free of errors and reads smoothly. These tools are commonly used in word processing software, email clients, and web browsers, among other applications. Regardless of their name or function, spelling checkers are a useful tool for anyone looking to improve their writing and avoid embarrassing mistakes in their communications.