bicker vs butt heads

bicker

verb
  • To quarrel in a tiresome, insulting manner. 

  • To skirmish; to exchange blows; to fight. 

  • To brawl or move tremulously, quiver, shimmer (of a water stream, light, flame, etc.) 

  • To patter. 

noun
  • A skirmish; an encounter. 

  • The process by which selective eating clubs at Princeton University choose new members. 

  • A wrangle; also, a noise, as in angry contention. 

  • A wooden drinking-cup or other dish. 

butt heads

verb
  • To argue uncompromisingly. 

  • To struggle against something that does not give way. 

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