a person who practices deception under an assumed character, identity, or name.
Also, imposter.

1580–90; < Late Latin, equivalent to Latin impos(i)-, variant stem of impōnere to deceive, place on (see impone) + -tor -tor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
impostor or imposter (ɪmˈpɒstə)
a person who deceives others, esp by assuming a false identity; charlatan
[C16: from Late Latin: deceiver; see impose]
imposter or imposter
[C16: from Late Latin: deceiver; see impose]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1586, from M.Fr. imposteur, from L.L. impostorem (nom. impostor), agent noun from impostus, collateral form of impositus, pp. of imponere "place upon, impose upon, deceive," from in- "in" + ponere "to put place" (see position). Imposture "act of willfully deceiving others" first recorded 1537.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Some may be suffering from the impostor syndrome at the beginning, not knowing if they fully belong to this community.
The bad feelings are displaced to a double, who is an impostor and may safely be rejected.
Once allowed access by the homeowner, the impostor sought cash for payment of a past due bill or for performing a service.
Sometimes distinguishing the real thing from an impostor takes a lot of expertise and know-how.
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