inflection vs phonation

inflection

noun
  • A change in pitch or tone of voice. 

  • Change in the form of a word (morphologic change) to express different grammatical categories. 

  • Diffraction. 

  • Any form produced by such an instance of a change, such as the principal parts for any given stem: any of the declined or conjugated forms that constitute its declension or conjugation. 

  • An affix representing such an instance. 

  • A turning away from a straight course. 

  • A change in curvature from concave to convex or from convex to concave. 

  • An instance of such change. 

phonation

noun
  • The process of producing vocal sound by the vibration of the vocal folds that is in turn modified by the resonance of the vocal tract. 

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