appeasement vs deadening

appeasement

noun
  • The state of being appeased; the policy of giving in to demands in order to preserve the peace. 

deadening

noun
  • A forest clearing created by girdling the trees. 

  • The process by which something is deadened. 

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