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Libeller - one who accuses falsely and maliciously, or publishes any false and defamatory statement in conversation or otherwise.

From the OED:

One who libels another; one who publishes a libel or libels.

From the OED a definition of the verb libel is:

To defame or discredit by the circulation of libellous statements; to accuse falsely and maliciously

And a definition of the noun libel is:

In popular use: Any false and defamatory statement in conversation or otherwise.

Libeller

From the OED:

One who libels another; one who publishes a libel or libels.

From the OED a definition of the verb libel is:

To defame or discredit by the circulation of libellous statements; to accuse falsely and maliciously

And a definition of the noun libel is:

In popular use: Any false and defamatory statement in conversation or otherwise.

Libeller - one who accuses falsely and maliciously, or publishes any false and defamatory statement in conversation or otherwise.

From the OED:

One who libels another; one who publishes a libel or libels.

From the OED a definition of the verb libel is:

To defame or discredit by the circulation of libellous statements; to accuse falsely and maliciously

And a definition of the noun libel is:

In popular use: Any false and defamatory statement in conversation or otherwise.

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Libeller

From the OED:

One who libels another; one who publishes a libel or libels.

From the OED a definition of the verb libel is:

To defame or discredit by the circulation of libellous statements; to accuse falsely and maliciously

And a definition of the noun libel is:

In popular use: Any false and defamatory statement in conversation or otherwise.