A family of Microsoft word processing software products for creating web, email, and print documents.
To help narrow down the issue:
- Are you using Word on Windows, Mac, Word for the web, or a mobile device?
- Is spell check not working in every document, or only this one?
- When you type an intentionally misspelled word, does Word underline it at all?
In the meantime, if you haven’t tried it yet, select the text, then go to "Review" > "Language" > "Set Proofing Language".
Make sure the correct language is selected and "Do not check spelling or grammar" is not checked.
Click "Add comment" to let me know.
Thanks!