roborant vs tonal

roborant

adj
  • That strengthens or energizes. 

noun
  • A restorative tonic. 

tonal

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

  • 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. 

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

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

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