prerogative vs rule

prerogative

noun
  • A right, or power that is exclusive to a monarch etc, especially such a power to make a decision or judgement. 

  • A right, especially when due to one's position or role. 

  • A hereditary or official right or privilege. 

  • A property, attribute or ability which gives one a superiority or advantage over others; an inherent advantage or privilege; a talent. 

adj
  • Characterized by lawless state actions, as in a prerogative state. 

  • Having a hereditary or official right or privilege. 

rule

noun
  • An order regulating the practice of the courts, or an order made between parties to an action or a suit. 

  • A determinate method prescribed for performing any operation and producing a certain result. 

  • A regulating principle. 

  • A ruler; device for measuring, a straightedge, a measure. 

  • A normal condition or state of affairs. 

  • A regulation, law, guideline. 

  • A straight line (continuous mark, as made by a pen or the like), especially one lying across a paper as a guide for writing. 

  • The act of ruling; administration of law; government; empire; authority; control. 

verb
  • To establish or settle by, or as by, a rule; to fix by universal or general consent, or by common practice. 

  • To regulate, be in charge of, make decisions for, reign over. 

  • To decide judicially. 

  • To mark (paper or the like) with rules (lines). 

  • To excel. 

How often have the words prerogative and rule occurred in a corpus of books? (source: Google Ngram Viewer )