A breach of the rules can be described in a number of ways. Some synonyms for this term include "violation", "infraction", "offense", "transgression", and "noncompliance". Other options include "infringement", "disobedience", "defiance", and "deviation". Each of these words conveys the idea that someone has broken a rule or crossed a line - whether that's a formal law, a workplace policy, or a social norm. Using these synonyms can help you avoid repetition and add diversity to your writing or speaking, while also more accurately conveying the gravity of the situation.