The noun mistake has 3 senses (first 3 from tagged texts)
1. (13) mistake, error, fault -- (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")
2. (6) mistake, misunderstanding, misapprehension -- (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")
3. (2) error, mistake -- (part of a statement that is not correct; "the book was full of errors")
Overview of verb mistake
The verb mistake has 2 senses (first 1 from tagged texts)
1. (7) mistake, misidentify -- (identify incorrectly; "Don't mistake her for her twin sister")
2. err, mistake, slip -- (to make a mistake or be incorrect)