One who cheats.
An improvised breaker bar made from a length of pipe and a wrench (spanner), usually used to free screws, bolts, etc. that are difficult to remove with a ratchet or wrench alone.
A person who creates forgeries, falsifies documents with intent to defraud, e.g. to create a false will or illicit copies of currency; counterfeiter.
A person who forges metals.