A family of Microsoft word processing software products for creating web, email, and print documents.
After some experimenting, I find that Word will embed the entire font in the .docx file of a document in Word format, but it insists on saving only the subset of characters used in the document when I save as a PDF. You can see that in the difference of the file sizes:
I think that embedding the full font in the PDF may require Adobe Acrobat.