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"mistake" is also used as a crossword clue. If that's what you saw, the answer is often error (5 letters).
Definitions
a wrong action attributable to bad judgment or ignorance or inattention
Word origin
From Middle English mistaken, from Old Norse mistaka (“to take in error, to miscarry”); equivalent to mis- + take. Cognate with Icelandic mistaka (“to mistake”), Swedish missta (“to mistake”) (before apocope misstaga).
Used in a sentence
“Sorry, I mistook you for my brother. You look very similar.”
“Don't mistake my kindness for weakness.”
“My father’s purposes have been mistook;”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Wrong choice”7 letters
02“Error”7 letters
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