Fun fact: Band-aid is a brand name by J&J company. They're actually adhesive bandages. But, in american we all just grew up calling them band-aids. We also call lip balm "chapstick" (which is another name brand).
It is intetesting how trade names become parts of languages . We were never allowed to use them at school. Nylon was one: which came from "New York and London". Hoover was another which I was forbidden to use and had to say the rather lengthy "suction cleaner".