invective vs knocking

invective

noun
  • An expression which inveighs or rails against a person. 

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

  • A severe or violent censure or reproach. 

  • A harsh or reproachful accusation. 

adj
  • Characterized by invection or railing. 

knocking

noun
  • An act in which something is knocked on, or the sound thus produced 

  • A repetitive ping, knock, or similar sound coming from an engine in which there are repeated uncontrolled explosions in the combustion chamber. 

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