noun
impostor
im-PAH-ster/ɪmˈpɑːstər/
Someone who assumes a false identity or falsely claims a role or status.
The impostor lifts a disguise mask to reveal a different face.

Etymology
The pieces describe someone who 'imposes upon': the underlying verb meant both 'place upon' and 'deceive.' The general sense 'deceiver' narrowed to someone who assumes a false identity or falsely claims a role or status.
In context
the great impostor. In the mid- 20th century, Deara assumed dozens of false identities.
More examples
- An impostor claimed the prize.
- Several impostors used the same story.
- She exposed the impostor.
Forms
impostor · impostors
impersonate verb — pretend to be another person
Similar words
- fraud
- A person or thing that falsely claims value or identity.
- pretender
- Claims a role or status without rightful entitlement.