5. Chapstick
When your lips dry out, do you take out your lip balm or your chapstick? Chances are you have answered the latter, which means that you’re actually using a brand name to replace a generic product. In fact, the name ChapStick is a brand of lip balm produced by Pfizer, another giant company. It’s used in many countries around the world and comes in a large variety.
Alas, the term has become a generic trademark and is used quite often to refer to similar items from a number of brands.