annoy vs pester

annoy

verb
  • To disturb or irritate, especially by continued or repeated acts; to bother with unpleasant deeds. 

  • To do something to upset or anger someone; to be troublesome. 

  • To molest; to harm; to injure. 

pester

verb
  • To bother, harass, or annoy persistently. 

noun
  • A bother or nuisance. 

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