mis·no·mer /ˌmɪsˈnomɚ/
  用詞不當
  Mis·no·mer n.  The misnaming of a person in a legal instrument, as in a complaint or indictment; any misnaming of a person or thing; a wrong or inapplicable name or title.
     Many of the changes, by a great misnomer, called parliamentary =\“reforms”.\=   --Burke.
     The word =\“synonym” is fact a misnomer.\=   --Whately.
  Mis·no·mer, v. t. To misname. [R.]
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  misnomer
       n : an incorrect or unsuitable name