Heart stoppage is a medical term used to refer to the sudden halt of heart functions. It can be caused by various factors such as heart disease, heart attack, or cardiac arrest. There are several synonyms for the term 'heart stoppage' that can be used interchangeably. Some of the common synonyms include cardiac arrest, myocardial infarction, cessation of heartbeat, and heart failure. Additionally, the term 'heart arrhythmia' and 'sudden cardiac death' can also be used to denote heart stoppage. However, it is crucial to consult with a medical professional to get accurate diagnoses and treatment plans for heart-related conditions.