alleviative vs ameliorative

alleviative

noun
  • That which alleviates; a drug or remedy. 

adj
  • That alleviates pain; palliative 

ameliorative

noun
  • That which betters or improves. 

  • A linguistic unit (such as a word, morpheme) that implies a positive or approving evaluation. 

adj
  • Of or relating to conceptual engineering, the normative study of which conceptual demarcation is most conducive to solve the problems the concept is a priori taken to solve. 

  • Suggesting or relating to a positive or approving evaluation. 

  • Able to repair or ameliorate. 

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