Nouns

(n)mistake, error, faulta wrong action attributable to bad judgment or ignorance or inattention“he made a bad mistake”, “she was quick to point out my errors”, “I could understand his English in spite of his grammatical faults”
(n)erroneousness, errorinadvertent incorrectness
(n)error, erroneous beliefa misconception resulting from incorrect information
(n)error, misplay(baseball) a failure of a defensive player to make an out when normal play would have sufficed
(n)error, wrongdoingdeparture from what is ethically acceptable
(n)error, computer error(computer science) the occurrence of an incorrect result produced by a computer
(n)error, mistakepart of a statement that is not correct“the book was full of errors”