Misnomer

Part of speech: noun (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. Whatel

Part of speech: verb (v.)

To misname. [R.]