due vs head-on

due

adj
  • Having reached the expected, scheduled, or natural time. 

  • Appropriate. 

  • Owing; ascribable, as to a cause. 

  • Owed or owing. 

  • Scheduled; expected. 

  • On a direct bearing, especially for the four points of the compass 

adv
  • Directly; exactly. 

noun
  • Deserved acknowledgment. 

  • That which is owed; debt; that which belongs or may be claimed as a right; whatever custom, law, or morality requires to be done, duty. 

  • Right; just title or claim. 

  • A membership fee. 

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. 

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