Final answer:
A nurse aiding a hospice client to make informed health decisions is acting as an advocate, supporting the patient's autonomy and ensuring they are fully informed.
Step-by-step explanation:
When a nurse is helping a hospice client make informed decisions about their health and life, the role they are performing is that of an advocate. In this role, the nurse supports the patient's right to make their own decisions, ensures that the patient has all the necessary information, and helps facilitate communication between the patient and other healthcare providers. Considering the nature of hospice care, which focuses on comfort and support rather than curative treatment, the advocacy role is crucial in respecting the patient's wishes and values at the end of life.