Prenuptial is a term often used in legal and marital contexts, describing an agreement or arrangement that is made before marriage. However, there are several synonymous words or phrases that can be used in place of prenuptial, including "premarital," "ante-nuptial," "engagement," or "marriage contract." Each of these terms highlights the same idea - that a legal agreement or arrangement is made before a couple enters into a marriage. These words may be used interchangeably and can be considered synonyms of one another, depending on the context and specific situation in which they are used.