The Microsoft Word Accessibility Checker tool can be used to identify and fix potential accessibility issues in your document.
The Accessibility Checker looks at images, tables, and heading structure, and will give you a report explaining any errors and how to fix them. As of Word 2016, the Accessibility Checker is available for both Windows and Mac versions of the software.
For directions on using the Accessibility Checker for Word, please visit the appropriate page from Microsoft Support: