[noun] [C] - a name that does not suit what it refers to, or a use of such a nameIt was scruffiest place I've ever stayed in, so 'Hotel Royal' was a bit of a misnomer.It's something of a misnomer to refer to these inexperienced boys as soldiers.
MISNOMER
Meaning of MISNOMER in English
Cambridge English vocab. Кембриджский английский словарь. 2012