ability vs potence

ability

noun
  • The quality or state of being able; capacity to do or of doing something; having the necessary power. 

  • A unique power of the mind; a faculty. 

  • A skill or competence in doing; mental power; talent; aptitude. 

  • Physical power. 

  • The legal wherewithal to act. 

potence

noun
  • power or strength; potency 

  • A stud that acts as a support of a pivot in a watch or clock 

  • Synonym of crutch 

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