The word "mandant" is often used in legal or business contexts to refer to a person who grants authority to another party to act on their behalf. However, there are many synonyms that can be used in place of "mandant" to convey the same meaning. Some examples include "principal," "grantor," "client," "patron," "sponsor," "assignor," "trustor," and "donor." Each of these synonyms can be used in different contexts depending on the specific relationship between the parties involved. Overall, using synonyms for "mandant" can help to add clarity and precision to legal or business communications.