Seth Godin in hist latest blog post:
And yes, there’s a mustard analogy in everything you do. In how you shake hands, in the typeface you use in your presentation (and whether you call it a ‘font’), in the volume you choose for your voice when in conversation.
Yes, there is a difference between “typeface” and “font”. Typeface refers to the style of a character, (Helvetica), font is the specific instance of that typeface (Helvetica 12 bold italic), which corresponds to a specific drawer with letters printers once used.
As someone who presents himself as a professional designer, I should be a purist, but don’t tell anyone, but I use the word “font” all the time. It sounds better is shorter, and an issue that is relevant for me recently: “font” is easier to fit in a dropdown menu of an application than “typeface”.