Cestui is a legal term that refers to a beneficiary or someone entitled to a trust or estate. There are several synonyms that can be used in place of Cestui, such as beneficiary, heir, legatee or devisee. These terms are often used interchangeably in legal documentation when referring to someone who is entitled to inherit or benefit from a trust or estate. While the term Cestui is commonly used in legal contexts, it may not be as familiar to individuals outside of the legal profession. It is important to have a clear understanding of these terms when managing an estate or trust to ensure proper distribution of assets.