blur vs confuse

blur

verb
  • To become indistinct. 

  • To cause imperfection of vision in; to dim; to darken. 

  • To transfer the input focus away from. 

  • To smear, stain or smudge. 

  • To make indistinct or hazy, to obscure or dim. 

noun
  • Something that appears hazy or indistinct 

  • A smear, smudge or blot 

adj
  • In a state of doubt or confusion. 

confuse

verb
  • To mix thoroughly; to confound; to disorder. 

  • to puzzle, perplex, baffle, bewilder (somebody); to afflict by being complicated, contradictory, or otherwise difficult to understand 

  • To mix up, muddle up (one thing with another); to mistake (one thing for another). 

  • To be confused. 

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