chance vs toss-up

chance

noun
  • probability; possibility. 

  • The probability of something happening. 

  • An opportunity or possibility. 

  • Random occurrence; luck. 

adj
  • Happening by chance, casual. 

verb
  • To try or risk. 

  • To discover something by chance. 

  • To rob, cheat or swindle someone. 

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 chance and toss-up occurred in a corpus of books? (source: Google Ngram Viewer )