invective vs mudslinging

invective

noun
  • A harsh or reproachful accusation. 

  • Something spoken or written, intended to cast shame, disgrace, censure, or reproach on another. 

  • A severe or violent censure or reproach. 

  • An expression which inveighs or rails against a person. 

adj
  • Characterized by invection or railing. 

mudslinging

noun
  • An act of making damaging or spiteful remarks with the intent to discredit. 

  • Casting aspersions with intent to discredit. 

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