mistake

noun:an action, decision, or belief that is wrong, inaccurate, or misguided
- Leaving the keys in the car was a costly mistake.
noun:a misunderstanding or misinterpretation of information, meaning, or intention
- The whole argument arose from a simple mistake about the deadline.
verb:to perform an action in an erroneous way, resulting in an incorrect outcome
- She mistook the recipe instructions and added too much salt.