pester vs unhinge

pester

verb
  • To bother, harass, or annoy persistently. 

noun
  • A bother or nuisance. 

unhinge

verb
  • To mentally disturb. 

  • To remove the leaf of a door or a window from its supporting hinges. 

  • To dislocate. 

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