ethic vs scruples

ethic

noun
  • The morality of an action. 

  • A set of principles of right and wrong behaviour guiding, or representative of, a specific culture, society, group, or individual. 

adj
  • Moral, relating to morals. 

scruples

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