ax to grind vs fascination

ax to grind

noun
  • A proposition or point of view to advocate, especially motivated by self-interest. 

  • A grudge or grievance, with implications of confrontation. 

fascination

noun
  • The state or condition of being fascinated. 

  • Something which fascinates. 

How often have the words ax to grind and fascination occurred in a corpus of books? (source: Google Ngram Viewer )