ax to grind vs obsessedness

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. 

obsessedness

noun
  • The quality of being obsessed; obsession. 

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