likeliness vs viability

likeliness

noun
  • Suitability; agreeableness. 

  • The condition or quality of being probable or likely to occur. 

  • Likeness; similarity. 

  • Likelihood, probability or chance of occurrence; plausibility or believability. 

viability

noun
  • The property of being viable; the ability to live or to succeed 

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