Maligner and Nitpicker

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

Nitpicker and maligner are semantically related in critic topic. In some cases you can use "Nitpicker" instead a noun "Maligner".

Nitpicker noun - A person given to harsh judgments and to finding faults.

Maligner and nitpicker are semantically related in critic topic. Sometimes you can use "Maligner" instead a noun "Nitpicker".