There are various synonyms for the term "mies fault" that can be used to describe someone who is responsible for a mistake or error. Some of the most commonly used words in this context include blunder, mistake, gaffe, error, slip-up, oversight, and fault. All of these words can be used to describe situations where someone has made a mistake or committed an error, whether intentionally or unintentionally. While each of these terms has its own nuances and connotations, they all convey a sense of responsibility or culpability on the part of the person who has made the mistake.