This series has been discussing the various definitions of the word “attorney.” Here is Black’s Law Dictionary’s definition of Advocate:
Advocate. One who assists, defends, or pleads for another. One who renders legal advice and aid and pleads the cause of another before a court or a tribunal, a counselor. A person learned in the law, and duly admitted to practice, who assist his client with advice, and pleads for him in open court. An assistant, adviser; a pleader of causes.
(Sixth Ed., West Publishing Co., 1990). Advocate appear in various types of matters including domestic abuse cases (where they are common).