[{"Bold_text": "noun", "List Items": ["a person or thing that moderates .", "a person who presides over a panel discussion on radio or television.", "a member of an online message board or electronic mailing list with privileges and responsibilities to approve or reject messages and uphold the terms of service.", "a presiding officer, as at a public forum, a legislative body, or an ecclesiastical body in the Presbyterian Church.", "Physics.a substance, as graphite or heavy water, used to slow neutrons to speeds at which they are more efficient in causing fission."]}]