noun
swindler; con artist; fraudster
A person who deceives others for money or gain; covers everything from small-time tricksters to large-scale fraudsters.
彼は詐欺師にだまされて貯金を全部取られた。
He was tricked by a con artist and lost all his savings.
あの男は有名な詐欺師で、何度も逮捕
That man is a well-known swindler who has been arrested many times.
ペテン師 is more colloquial and often implies a small-time trickster or smooth talker, while 詐欺師 is the standard term for a swindler.
Compound of 詐欺 (fraud) and 師 (master, specialist). The word is transparently derived from its components.