an act of pretending to be another person for the purpose of entertainment or fraud.
Impersonation is when someone pretends to be another person. If you pretend to be your twin brother all day at school, that's impersonation.
impersonate is used when someone tries to look and sound like another person as much as possible. You're good at impersonating celebrities. play is used when someone takes a part in a play, movie, or TV show.