I have several: Nauseous vs nauseated When people use the terms "weight" and "mass" interchangeably When people use light-year as a unit of time When people still use the Bohr model to illustrate an atom When people use the terms "speed" and "velocity" interchangeably When people refer to a Lamborghini as a sports car When someone puts a glasspack on a minivan Just to name a few.