disarticulation vs disengagement

disarticulation

noun
  • The act of disarticulating. 

  • Some amputations: where a joint is disarticulated: e.g. knee, hip, elbow or shoulder disarticulation. 

disengagement

noun
  • Release or detachment from a physical situation or other involvement. 

  • Termination of an agreement to be married. 

  • Withdrawal from combat, confrontation, or the assertion of influence. 

  • The release or separation of a chemical. 

  • A circular movement of the blade that blocks an opponent's parry. 

  • The emergence of the fetus from the birth canal. 

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