If you want to send somebody a document which needs to be encrypted you could save as a PDF and encrypt with a password.
From your Word document - you will need to have opened in the Desktop App as these steps aren't available in the browser:
- Go to File -> Save As (or Save a Copy)
- Click on More options...
- Change Save as type to PDF.
- Click on Options and then tick Encrypt the document with a password (at the bottom of the list)
- Ener the password you want to use and confirm, then press OKĀ and save the file.
- The file should now open in the PDF viewer and require a password.
You can now send your file via e-mail, make sure that you do not send the password in the same message, preferably send by a different method e.g. telephone.