The Islamic title of EMIR (4 letters) is a title of nobility, usually referring to a prince or ruler. Imam (4 letters) is a religious leader, often the leader of a mosque or Islamic community. CALIPH (6 letters) is a title for a successor to the prophet Muhammad, and is considered the spiritual leader of the Islamic world. AYATOLLAH (9 letters) is a high-ranking title given to a Shia Muslim cleric who is seen as an authority on Islamic law and theology.