A safe deposit vault is a secure place that's used to store valuable items, documents, or money. However, there are several synonyms that can be used to describe a safe deposit vault. For instance, a "bank safe" is a common synonym for a safe deposit vault as it's located inside a bank. Also, the term "bank vault" is occasionally used interchangeably with a safe deposit vault. A "lockbox" can also refer to a safe deposit vault, especially when the owner rents a lockbox from a bank to store their valuables. Other synonyms for safe deposit vault include "security box", "safety deposit box", and "strongbox". These synonyms all describe spaces that guarantee the safety and security of their contents.