butt heads vs scuffle

butt heads

verb
  • To argue uncompromisingly. 

  • To struggle against something that does not give way. 

scuffle

verb
  • To fight or struggle confusedly at close quarters. 

  • To walk with a shuffling gait. 

  • To make a living with difficulty, getting by on a low income, to struggle financially. 

noun
  • A rough, disorderly fight or struggle at close quarters. 

  • Poverty; struggle. 

  • A Dutch hoe, manipulated by both pushing and pulling. 

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