mistake in WordNet English dictionary

1. to make a mistake or be incorrect
   err  mistake  slip 
   
2. identify incorrectly
   "Don't mistake her for her twin sister"
   mistake  misidentify 
   

1. a 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"
   mistake  error  fault 
   
2. part of a statement that is not correct
   "the book was full of errors"
   error  mistake 
   
3. an understanding of something that is not correct
   "he wasn't going to admit his mistake"; "make no mistake about his intentions"; "there must be some misunderstanding--I don't have a sister"
   mistake  misunderstanding  misapprehension