impostor

charlatan

Faker claiming false expertise

• fraudIntentional criminal trickery
• con artistProfessional fraud perpetrator
• swindlerPerson who deceives for money

hoaxer · faker · phony · scammer · trickster · cheat · mountebank · grifter · quack · pretender

mask

Face-worn concealment

• costumeClothing for portrayal
• camouflageConcealment through visual blending
• incognitoWith identity concealed

cover · facade · front · guise · concealment · false papers · wig · makeup · prosthetics · transformation

doppelganger

Supernatural duplicate of oneself

• lookalikeOne who closely resembles another
• doubleTwice the amount
• mimicOne who copies others

copycat · stand-in · body double · ringer · decoy · poseur · masquerader · assumed identity · alias · persona

mole

Subterranean insectivore

• spyCovert information gatherer
• double agentSpy betraying their side
• sleeper agentEmbedded spy awaiting activation

saboteur · plant · inside man · undercover · operative · turncoat · traitor · fifth columnist · trojan horse · deep cover

fake

Not the real thing

• forgeryCreating fraudulent imitations
• knockoffUnauthorized replica product
• replicaFaithful scaled reproduction

sham · bogus · spurious · imitation · false · pseudo · ersatz · fraudulent · inauthentic · fabricated

self-doubt

Uncertainty about oneself

• inadequacyState of being insufficient
• undeservingNot meriting what's given
• anxietyPersistent apprehensive distress

insecurity · perfectionism · overachiever · attribution · competence · belonging · validation · authenticity · phoniness · high achiever

• swindlerscon artist, swindler, fraudster, scammer, grifter
• Mistaken Identitywrong person, lookalike, doppelganger, mix-up, confusion
• Mobile Game CharactersAngry Birds, Red, Flappy Bird, Colt, Spike
• deceptionlie, lies, lying, fake, fraud
• identityidentity, personal identity, self, selfhood, self-expression
• cheaterscheat, cheater, con artist, swindler, deceiver