(a) one who writes incorrectly; (b) a forger.

One who falsifies.

One who makes fraudulent imitations (of documents, coins, etc.); a counterfeiter.

One who forges a document; a forger.

A false writer, a forger; = pseudographer, n. Obsolete. rare.

A false or erroneous writer; esp. a person who counterfeits another's writing, a forger.

A person who falsifies, adulterates, or tampers with something. Frequently with modifier indicating what has been falsified, etc.

colloquial. A person who fraudulently alters account books or other records. Cf. cook, v.1 6.