misnomer
Concise Oxford English Dictionary © 2008 Oxford University Press:
misnomer/mɪsˈnəʊmə(r)/
▶noun a wrong or inaccurate name or term.
■ the wrong use of a name or term.
– origin ME: from Anglo-Norman Fr., from the OFr. verb mesnommer, from mes- ‘wrongly’ + nommer ‘to name’ (based on L. nomen ‘name’).
'misnomer' also found in these Oxford entries:
