A person who deceives others for money or gain; often used for fraudsters, impostors, or smooth-talking tricksters.
He was tricked by a swindler and lost all his savings.
That salesman is practically a con artist.
Standard spelling; ペテン is usually written in katakana.
Hiragana variant of the same word; less common but still encountered.
ペテン is a word of uncertain origin meaning fraud or trickery; 師 denotes a practitioner or specialist. Together they mean a person who practices fraud.