flout vs knock

flout

noun
  • A mockery or insult. 

  • The act by which something is flouted; violation of a law. 

verb
  • To express contempt for (laws, rules, etc.) by word or action. 

knock

noun
  • A criticism. 

  • An abrupt rapping sound, as from an impact of a hard object against wood. 

  • A sharp impact. 

  • A batsman's innings. 

  • A blow or setback. 

  • Preignition, a type of abnormal combustion occurring in spark ignition engines caused by self-ignition; also, the characteristic knocking sound associated with it. 

  • Synonym of hunger knock 

verb
  • To criticize verbally; to denigrate; to undervalue. 

  • To kick a ball towards another player; to pass. 

  • To rap one's knuckles against something, especially wood. 

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