i am using the vocab off the top of my head; this can be inaccurate

typeface - a series of alphanumerical symbols for design and digital writing

ABC Favorit is the default typeface for tumblr

font - a subtype* of a typeface

e.g. ABC Favorit Italic and ABC Favorit Bold are 2 different fonts, but the same typeface

hypercorrection - since english is subjective, not objective, the word 'font' has and still is being used as the word 'typeface'

hypercorrections are when words change because many people started to say the etymollogically wrong word

e.g. octopi is the grammatically wrong plu. for octopus, as it should be octopuses or octopodes

octopi has been used instead of octopuses or octopodes because people started to say octopi and it catched on

sorry if this sounded confusing