butt heads vs tiff

butt heads

verb
  • To argue uncompromisingly. 

  • To struggle against something that does not give way. 

tiff

verb
  • To quarrel. 

  • To have lunch. 

noun
  • A small argument; a petty quarrel. 

  • Liquor; especially, a small draught of liquor. 

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