noun (n)

• a representation of a person that is exaggerated for comic effect(noun.communication)

  Synonym:
  caricature, imitation
  

  source: wordnet30
• pretending to be another person(noun.act)

  Synonym:
  imposture
  

  source: wordnet30
• imitating the mannerisms of another person(noun.act)

  Synonym:
  personation
  

  source: wordnet30
• The act of impersonating; personification; investment with personality; representation in a personal form.(noun)

  source: webster1913