apostle β The apostles were the followers of Jesus Christ who went from place to place telling people about him and trying to persuade them to become Christians.
attorney β In the United States, an attorney or attorney at law is a lawyer.
champion β A champion is someone who has won the first prize in a competition, contest, or fight.
exponent β One who expounds, represents or advocates.
pleader β a person who pleads, especially at law.
proposer β to offer or suggest (a matter, subject, case, etc.) for consideration, acceptance, or action: to propose a new method.
speaker β Tris(tram E.) 1888β1958, U.S. baseball player.
spokesperson β a person who speaks for another or for a group.
upholder β to support or defend, as against opposition or criticism: He fought the duel to uphold his family's honor.
challenger β A challenger is someone who competes with you for a position or title that you already have, for example being a sports champion or a political leader.
booster β A booster is something that increases a positive or desirable quality.
demonstrator β Demonstrators are people who are marching or gathering somewhere to show their opposition to something or their support for something.
expositor β A person or thing that explains complicated ideas or theories.
propagandist β a person involved in producing or spreading propaganda.
protagonist β the leading character, hero, or heroine of a drama or other literary work.
second β next after the first; being the ordinal number for two.