kindling vs provocation

kindling

noun
  • The act by which something is kindled. 

  • Small pieces of wood and twigs used to start a fire. 

adj
  • Illuminated, lit. 

provocation

noun
  • The act of provoking, inciting or annoying someone into doing something 

  • The second step in OPQRST regarding the investigation of what makes the symptoms MOI or NOI improve or deteriorate. 

  • Something that provokes; a provocative act 

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