sparring vs tiff

sparring

noun
  • The act of one who spars. 

tiff

noun
  • A small argument; a petty quarrel. 

  • Liquor; especially, a small draught of liquor. 

verb
  • To have lunch. 

  • To quarrel. 

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