exasperation vs placation

exasperation

noun
  • The act of exasperating or the state of being exasperated; irritation; keen or bitter anger. 

  • Increase of violence or malignity; aggravation; exacerbation. 

placation

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

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