Definition of misnomers:
(n) :
(by extension) An incorrect use of a term, especially one which is misleading; a misname.
(n) :
(by extension) A term which is misleading, even if firmly established, technically correct, or both.
(n) :
(law) A mistake in the naming of a person or place; a misidentification.
(v) :
(transitive) To use an incorrect, and especially misleading, name for (someone or something); to misidentify, to misname.
(n) :
(by extension) (nonstandard, proscribed) Something which is asserted not to be true; a mistaken belief, a falsehood, a myth.