Advocate noun ad·vo·cate \ˈad-və-kət, -ˌkāt\ 1: one who pleads the cause of another; 2: one who defends or maintains a cause or proposal; 3: one who supports or promotes the interests of a cause or group.
verb ad·vo·cate \ˈad-və-ˌkāt\ 1: to support or argue for (a cause, policy, etc.); 2: to plead in favor of