Con artist and Maligner

Con artist noun - A swindler who exploits the confidence of his victim.

Maligner and con artist are semantically related In some cases you can use "Maligner" instead a noun phrase "Con artist".

Maligner noun - One who attacks the reputation of another by slander or libel.

Con artist and maligner are semantically related in liar topic. You can use "Con artist" instead a noun "Maligner", if it concerns topics such as person who tells falsehood.