mislabeling

/M IH0 S L EY1 B AH0 L IH0 NG/
verb
  1. 1

    To label incorrectly.

    โ€œBe sure not to mislabel the files or you'll never find them again!โ€

noun
  1. 1

    An incorrect labeling.

Source: https://en.wiktionary.org/wiki/mislabel, https://en.wiktionary.org/wiki/mislabeling