placation vs provocation

placation

noun
  • A process or act of placating; appeasement or an expression of appeasement. 

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 placation and provocation occurred in a corpus of books? (source: Google Ngram Viewer )