engrossment vs hyperfixation

engrossment

noun
  • The state of being engrossed; concentration or preoccupation. 

  • The fact or instance of preparing the final draft legal document for execution or completion. 

  • Such document that has not yet been executed or completed. 

hyperfixation

noun
  • A complete obsession or absorption in a subject or hobby to a point where a person appears to completely tune out their surroundings and where the person repeatedly returns to said subject or material. 

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