A power of attorney with right of substitution, also known as a durable power of attorney, is a legal document that grants someone the authority to make decisions or act on behalf of another. Some synonyms for this term include proxy, representative, surrogate, deputy, attorney-in-fact, and agent. These terms all refer to a trusted individual who has been given the power to make decisions and take action on behalf of another person. This document can be useful in situations where a person is unable to make decisions on their own, due to illness, incapacity, or other reasons. It is important to choose a trustworthy and competent individual to act as a power of attorney with right of substitution.