attainableness vs toss-up

attainableness

noun
  • The state or quality of being attainable. 

toss-up

noun
  • Either of two outcomes that are equally likely. 

  • A decision in which neither choice is clearly favorable or unfavorable, or for which the outcome does not matter. 

  • The toss of a coin used to decide some issue. 

How often have the words attainableness and toss-up occurred in a corpus of books? (source: Google Ngram Viewer )