conscience vs ethics

conscience

noun
  • The moral sense of right and wrong, chiefly as it affects a person’s own behaviour and forms their attitude to their past actions. 

  • A personification of the moral sense of right and wrong, usually in the form of a person, a being or merely a voice that gives moral lessons and advices. 

ethics

noun
  • Morality. 

  • The study of principles relating to right and wrong conduct. 

  • The standards that govern the conduct of a person, especially a member of a profession. 

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