harass vs sweeten

harass

verb
  • To put excessive burdens upon (someone); to subject (someone) to anxieties. 

  • To persistently bother (someone, or a group of people) physically or psychologically when such behaviour is illegal and/or unwanted, especially over an extended period. 

  • To annoy (someone) frequently or systematically; to pester. 

  • To trouble (someone, or a group of people) through repeated military-style attacks. 

sweeten

verb
  • To make (more) pleasant or to the mind or feelings. 

  • To supplement (a composition) with additional instruments, especially strings. 

  • To make pure and salubrious by destroying noxious matter. 

  • To make warm and fertile. 

  • To restore to purity; to free from taint. 

  • To become sweet. 

  • To make less painful or laborious; to relieve. 

  • To soften to the eye; to make delicate. 

  • To make sweet to the taste. 

  • To make more attractive; said of offers in negotiations. 

  • To make mild or kind; to soften. 

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