confrontation vs head-to-head

confrontation

noun

  • The act of confronting or challenging another, especially face to face. 

  • A conflict between armed forces. 

head-to-head

adj

  • Direct, one-to-one. 

adv

  • Directly, one-to-one. 

  • Facing one another. 

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