operable vs workable

operable

adj
  • Able to be put into operation; practicable 

  • Able to be operated or used 

  • Able to be treated by surgery 

workable

adj
  • Capable of functioning. 

  • Able to be worked or fashioned 

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