misnomer
/ˌmɪsˈnəʊmə(r)/noun
1- a wrong or inaccurate name or designation错误（或不恰当）的名字（或称呼）：
'King crab' is a misnomer-these creatures are not crustaceans at all.
“大王蟹”名称不当——这东西根本不是甲壳动物。
1.1
- a wrong or inaccurate use of a name or term名字（或术语）误用：
to call this neighbourhood policing would be a misnomer.
称这为小区治安管理是不恰当的。
词源
late Middle English: from Anglo-Norman French, from the Old French verb mesnommer, from mes- 'wrongly' + nommer 'to name' （based on Latin nomen 'name'）.