alterative vs ameliorative

alterative

adj
  • Gradually changing, or tending to change, a morbid state into a healthy one. 

  • Causing alteration. 

noun
  • A medicine or treatment which works by changing processes within the body, rather than by evacuating something etc. 

ameliorative

adj
  • Able to repair or ameliorate. 

  • 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. 

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

  • That which betters or improves. 

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