malign vs muckrake

malign

verb
  • To make defamatory statements about; to slander or traduce. 

adj
  • Evil or malignant in disposition, nature, intent or influence. 

  • Malevolent. 

  • Malignant. 

muckrake

verb
  • To search for and expose corruption or scandal, especially as a form of investigative journalism. 

noun
  • A rake for scraping up dung. 

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