A piggy bank is a popular money-saving device that helps people store their spare change and small bills. Synonyms for a piggy bank include coin bank, money box, savings box, coin jar, and change jar. These words are often used interchangeably, but they have slight differences in meaning. A coin bank or money box typically refers to a small container that is used to store coins or bills. A savings box has a similar function, but it is usually associated with long-term saving goals. A coin jar or change jar is specifically designed to hold loose change and small bills. Whatever you call it, a piggy bank is a great way to save money and manage your finances.