alleviation vs therapy

alleviation

noun
  • the act of alleviating; relief or mitigation. 

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

therapy

noun
  • Healing power or quality. 

  • Attempted remediation of a health problem following a diagnosis, usually synonymous with treatment. 

  • Specifically, psychotherapy. 

verb
  • To treat with a therapy. 

  • To undergo a therapy. 

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