spec vs spitball

spec

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

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

spitball

noun
  • A pitch of a baseball that has been partly covered with saliva, illegal at most levels. 

  • A balled-up piece of paper, moistened with saliva (by chewing) and shot through a drinking straw. 

verb
  • To brainstorm ideas. 

  • To moisten the ball with saliva before pitching it. 

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