What's the difference between jeerer and mocker?

Jeerer

Definition:

• (n.) A scoffer; a railer; a mocker.

Example Sentences:

Mocker

Definition:

• (n.) One who, or that which, mocks; a scorner; a scoffer; a derider.
• (n.) A deceiver; an impostor.
• (n.) A mocking bird.

Example Sentences:

• (1) That is helped by having friends; you don’t need a large number, just two or three talented, fond mockers – very, very useful.
• (2) One of the most important parts of the Jewish tradition of self-mockery is the mocker in question is targeting himself – and Trump is not Jewish.