The term 'Peter or Paul' can be broken down into four crossword solutions: SAINT (5 letters), CZAR (4 letters), TSAR (4 letters), and APOSTLE (7 letters). SAINT refers to a person who is considered holy or virtuous, and in this context it is likely referring to either Peter or Paul, both of whom were Christian saints. CZAR and TSAR are both titles used by rulers of Russia, and both Peter and Paul have been referred to as Czars or Tsars. Finally, APOSTLE refers to one of the twelve disciples of Jesus Christ, and both Peter and Paul were among them.