Assurer is a word that can be used to describe someone who guarantees or secures something. This word has many synonyms that can be used interchangeably. Some of the most common synonyms for assurer include guarantor, protector, insurer, keeper, defender, and safeguard. These words all convey the same meaning as assurer, but with slightly different connotations. While guarantor and insurer focus on financial matters, protector and defender focus on physical safety. Keeper and safeguard suggest a sense of responsibility for preserving something, while assurer focuses more on the act of making a promise or offering a guarantee. Regardless of which synonym is used, the underlying message is one of assurance and security.