operable vs viable

operable

adj
  • Able to be put into operation; practicable 

  • Able to be operated or used 

  • Able to be treated by surgery 

viable

adj
  • Able to be done, possible, practicable, feasible. 

  • Capable of working successfully 

  • Able to live on its own (as for a newborn). 

  • Able to live and develop. 

noun
  • An organism that is able to live and develop. 

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