conscience vs scruple

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. 

scruple

noun
  • Hesitation to act from the difficulty of determining what is right or expedient; doubt, hesitation or unwillingness due to motives of conscience. 

  • A weight of ¹⁄₂₈₈ of a pound, that is, twenty grains or one third of a dram, about 1.3 grams (symbol: ℈). 

  • A Hebrew unit of time equal to ¹⁄₁₀₈₀ hour. 

verb
  • To excite scruples in; to cause to scruple. 

  • To hesitate or be reluctant to act due to considerations of conscience or expedience. 

  • To regard with suspicion; to question. 

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