flectional vs inflectional

flectional

adj
  • Pertaining to flection; serving to bend or vary, specifically, pertaining to the terminal variation of words; inflectional. 

inflectional

adj
  • Of or pertaining to inflection. 

  • Of or pertaining to a point of inflection of a curve. 

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