advisability vs opportunity

advisability

noun
  • The quality of being advisable or prudent. 

  • An instance of advisability; a consideration in determining overall advisability. 

opportunity

noun
  • opportuneness 

  • A favorable circumstance or occasion. 

  • A chance for advancement, progress or profit. 

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