compunction vs repentance

compunction

noun
  • A pricking of conscience or a feeling of regret, especially one which is slight or fleeting. 

repentance

noun
  • A feeling of regret or remorse for doing wrong or sinning. 

  • The condition of being penitent. 

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