remedial vs tonal

remedial

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

  • curative; providing a remedy 

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

tonal

adj
  • Of or relating to the general character, mood, or trend of something. 

  • Employing differences in pitch (tones) to distinguish differences in the meaning of otherwise similar words (words which would otherwise be homophonic). 

  • Of or relating to tones or tonality. 

  • Employing tones that have a predictable relationship to some tonic. 

noun
  • An animal companion which accompanies a person from birth to death. 

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