Hi,
As per your description, I think it should be the Help Improve Proofing Tools
feature.
The Help Improve Proofing Tools feature collects data about your use of the Proofing Tools and sends it to Microsoft, such as accepting or rejecting spelling or grammar checker suggestions, changing proofing tool settings, or additions to
the custom dictionary.
Before any data is sent to Microsoft, a dialog box appears to ask your permission. At that time, you can delete some or all of the entries before the information is sent.
At Microsoft, we're working hard to protect your privacy, we only use this information solely to improve our products, not to identify users. If you are concerned that a report might contain personal or confidential information, do not send the report.
Regards,
Ethan Hua
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs.