head-on vs intensive

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. 

intensive

adj
  • Characterized by persistence; intent; assiduous. 

  • Serving to give force or emphasis. 

  • Thorough; to a great degree; with intensity. 

  • Demanding; requiring a great amount of work etc. 

  • Related to the need to manage life-threatening conditions by means of sophisticated life support and monitoring. 

  • Highly concentrated. 

noun
  • A form of a word with a stronger or more forceful sense than the root on which the intensive is built. 

  • A course taught intensively. 

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