alterative vs remedial

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. 

remedial

adj
  • curative; providing a remedy 

  • intended to remediate (i.e., correct or improve) deficient skills in some subject 

noun
  • A pupil enrolled in special classes to improve deficient skills. 

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