pro vs saving grace

pro

noun
  • An advantage of something, especially when contrasted with its disadvantages (cons). 

  • Professional. 

  • A prostitute. 

  • A professional sportsman. 

  • A chemical prophylaxis taken after sex to avoid contracting venereal disease. 

  • A person who supports a concept or principle. 

adj
  • Professional. 

prep
  • In favor of. 

saving grace

noun
  • A redeeming quality or factor. 

  • God's grace or blessing, enabling sinners to attain salvation. 

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