attainable vs doable

attainable

noun
  • Something that can be attained. 

adj
  • Able to be accomplished, achieved, or obtained. 

doable

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

adj
  • Possible to do; feasible. 

  • Worthy of sexual conquest. 

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