catalyst vs trigger point

catalyst

noun
  • An inciting incident that sets the successive conflict into motion. 

  • A substance that increases the rate of a chemical reaction without being consumed in the process. 

  • A catalytic converter. 

  • An object that facilitates the casting of a spell (such as a magic wand). 

  • Something that encourages progress or change. 

trigger point

noun
  • An event, arrangement, provocation, etc. that leads a certain, generally violent or angered, action to be taken. 

  • A hyperirritable spot in the skeletal muscle; a point in tender muscle that tends to elicit pain upon pressure or touch. ᵂᵖ 

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