There are several different terms that can be used as synonyms for the phrase "heart arrest." Some of the most common of these include cardiac arrest, sudden cardiac arrest, and heart failure. While each of these phrases may be used interchangeably to describe a situation where the heart stops beating correctly, there are some differences in meaning between them. For example, cardiac arrest specifically refers to a situation where the heart stops beating altogether, while heart failure can refer to a broader range of heart conditions that may lead to a similar outcome. Ultimately, whether one uses "heart arrest," "cardiac arrest," or another term will depend largely on the context and specific details of the situation.