https://www.google.tt/search?q=paper+cup&rlz=1C9BKJA_enTT788TT788&oq=paper+cup&aqs=chrome..69i57j0l3.1503j0j7&hl=en-US&sourceid=chrome-mobile&ie=UTF-8 Ummm
Its not about what its made of, its about the shape. Cup is a shape. A cup can be made of paper, plastic, glass, porcelain or even metal So can a bowl or a plate
My dude They're called cupcakes bc in the days before, ppl baked them in various "cups" and that's how they got their name/shape