alleviation vs appeasement

alleviation

noun
  • the act of alleviating; relief or mitigation. 

  • the act of reducing pain or anything else unpleasant; easement 

appeasement

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

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