imposter

/IH0 M P AO1 S T ER0/
noun
  1. 1

    Someone who attempts to deceive by using an assumed name or identity.

  2. 2

    A sprite or animation integrated into a three-dimensional scene, but not based on an actual 3D model.

Synonyms

Source: https://en.wiktionary.org/wiki/imposter, https://en.wiktionary.org/wiki/impostor