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When writing or speaking, I use the words “mistake” and “error” interchangeably. The definitions in some dictionaries are comically circular.

Dictionary.com defines an error as:

“a deviation from accuracy or correctness; a MISTAKE, as in action or speech.”

It also defines a mistake as:

“an ERROR in action, calculation, opinion, or judgment caused by poor reasoning, carelessness, insufficient knowledge, etc.”

So, a mistake is an error, and an error is a mistake.