...
When you install Acrobat Pro, it installs an add-on to the Ribbon in Word with some utilities for Acrobat conversion. Using the Acrobat Pro utilities will give you the best results when converting to PDF format. You may still need to touch up the final result in Acrobat Pro. This is important with complex documents, but the Acrobat Pro Add-on is still the most reliable tool for the job.
Click File.
Click Export.
Choose either Create Adobe PDF or Create PDF/XPS Document (both options create a tagged document).
...