Malapropisms

Malapropisms are the misuse of words, usually due to substituting words that resemble the ones that should have been used. The word itself derives from the character Mrs Malaprop in Sheridan’s ‘The Rivals’. Other people have produced similar word errors, and have called this by their own name. Some English exams use malapropisms that need correcting.
Example: "Did you read the epithet on late Mr Greenses headstone." Should be "Did you read the epitaph on late Mr Green’s headstone?"
Or: "The allusion caused by the mural was extraordinary." Should be "The illusion caused by the mirage was extraordinary."