You having a font doesn't make it available to other users. If you buy a typeface and use it in your documents, it works for you but won't be available to others if they open the document in Word. You could print the document or save it to PDF to allow others to see the typeface correctly but not if you are sending them Word docs.
In theory, you can embed fonts into a Word or Powerpoint document but in my experience this doesn't work as advertised. You have to also ensure that the licencing provided with that font allows embedding - read the fine print on the font licence. Also, font embedding only works for particular font formats (TTF or OTF). See
Embed fonts in Word or PowerPoint - Office Support for more information.