speculate vs toss up

speculate

verb
  • To make a risky trade in the hope of making a profit; to venture or gamble. 

  • To make an inference based on inconclusive evidence; to surmise or conjecture. 

  • To anticipate which branch of code will be chosen and execute it in advance. 

toss up

verb
  • To make a decision based on chance, for example by flipping a coin or rolling a dice. 

  • To produce, generate. 

  • To casually mention as an idea. 

  • To vomit. 

  • To beat up, thrash. 

  • To cook something quickly. 

  • To throw something upwards. 

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