backronym

/ˈbæk.ɹəˌnɪm/

IPA: /B AE1 K R AH0 N IH0 M/

noun
  1. 1

    A word that is originally not an acronym but is turned into one by devising a full form for it, sometimes as a folk etymology, sometimes as a contrived acronym to name a new organization, proposal, or other entity.

verb
  1. 1

    To create a backronym.

Source: https://en.wiktionary.org/wiki/backronym