doable vs operable

doable

adj
  • Possible to do; feasible. 

  • Worthy of sexual conquest. 

noun
  • Something that can be done; a possible or practical task. 

operable

adj
  • Able to be put into operation; practicable 

  • Able to be operated or used 

  • Able to be treated by surgery 

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