A typeface is a style set of letters, numbers, and characters in a similar design. A font is a file with an individual style of a typeface. ‘Inter’ is a typeface. ‘InterBold.ttf’ or ‘InterItalic.ttf’ are fonts.
It is always more familiar and understandable to say ‘Font.’ It is the more common term. So, it is not a problem to call both typeface and a separate style file with the ‘Font’ word, especially if you are discussing typography with a client or someone not involved in design nuances.
This guide almost always uses “Font” when referring to a font family or an individual file. It is easier that way. Sometimes, we use the word ‘Typeface” to make a difference or avoid repetition in the text.