head-on vs truculent

head-on

adj
  • Direct, abrupt, blunt or unequivocal; not prevaricating. 

  • Of a collision, from the front or in the direction of motion. 

adv
  • With the front of a vehicle. 

  • With direct confrontation. 

noun
  • A collision from the front. 

truculent

adj
  • Defiant or uncompromising. 

  • Eager or quick to argue, fight or start a conflict. 

  • Cruel or savage. 

  • Deadly or destructive. 

How often have the words head-on and truculent occurred in a corpus of books? (source: Google Ngram Viewer )