If you want to know about the hotkey or shortcut key for the spell checker of Windows 11/10, then there is no shortcut key for that. You need to open the Settings app of Windows 11/10 to access the spell checker option to turn it on/off. The steps covered above in this post will help you turn on/off the spell checker in Windows 11/10. On the other hand, if you want to know about the shortcut key for spelling and grammar check feature for MS Word, then it is F7. Likewise, other similar tools (that support such a feature) might also have some hotkey for the same. You need to access the Settings of that particular tool to find out about that.