misnomer

A use of a term that is misleading; a misname.

“Calling it a driveway is a bit of a misnomer, since you don't drive on it, you park on it.”

A term that is misleading.

“Chinese checkers is a misnomer since the game has nothing to do with China.”

A term whose sense in common usage conflicts with a technical sense.

Something asserted not to be true; a myth or mistaken belief

“It's a misnomer that engineers can't write.”

To use a misleading term; to misname.