obsession vs reliance

obsession

noun
  • An activity or entity that inspires a compulsive and potentially unhealthy fixation, or the fixation thereby inspired. 

  • An idea that engenders a compulsive or irrational preoccupation, or the preoccupation thereby engendered. 

  • The quality of being obsessed. 

  • Influence or control by evil spirits without possession. 

reliance

noun
  • A person or thing which relies on another. 

  • The condition of being reliant or dependent. 

  • The act of relying (on or in someone or something); trust. 

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