spec vs speculate

spec

verb
  • To specify, especially in a formal specification document. 

noun
  • A spectacular mark (catch) in Australian rules football. 

speculate

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

  • 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. 

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