remedial vs treatable

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. 

treatable

adj

  • Able to be treated; not incurable. 

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