We can generate a Word template that includes the embedded Fonts. PDF Butler only supports .ttf fonts.
.otf fonts are NOT supported. Once this is enabled, PDF Butler will automatically generate the document with those fonts.
Please notify our Support team (Support@pdfbutler.com), with your PDF Butler Username, and then they will enable this feature for you.
To embed the fonts in the documents, you need to enable this option on the template (Word File).

Note: The DOCX template will be very big with embedded fonts . Make sure to keep in mind the size of the template so that salesforce limits should not be hit.