Which tool is primarily used to check for and correct misspelled words in a document?

The tool that is primarily used to check for and correct misspelled words in a document is Spell Check. This function scans the text for any words that do not match its internal dictionary, highlighting them for review and offering suggestions for correction. It is essential for ensuring written communication is professional and free of spelling errors, as misspellings can undermine credibility and clarity.

While the other options serve important functions in document editing, they do not directly address spelling. A Thesaurus provides synonyms and antonyms to enhance vocabulary but does not check spelling. Grammar Check evaluates the structure and syntax of sentences rather than focusing specifically on spelling. The Format Painter is a tool used to copy formatting from one part of a document to another, which is unrelated to the checking or correcting of spelling. Thus, Spell Check is the correct solution for identifying and fixing misspellings.