quiz vs tug-ofwar

quiz

noun
  • A competition in the answering of questions. 

  • A school examination of less importance, or of greater brevity, than others given in the same course. 

verb
  • To instruct (someone) by means of a quiz. 

  • To question (someone) closely, to interrogate. 

tug-ofwar

How often have the words quiz and tug-ofwar occurred in a corpus of books? (source: Google Ngram Viewer )