blur vs smudge

blur

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

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

  • To become indistinct. 

  • To transfer the input focus away from. 

  • To smear, stain or smudge. 

adj
  • In a state of doubt or confusion. 

noun
  • Something that appears hazy or indistinct 

  • A smear, smudge or blot 

smudge

verb
  • To obscure by blurring; to smear. 

  • To subject to ritual burning of herbs (suffumigation, smudging). 

  • To stifle or smother with smoke. 

  • To soil or smear with dirt. 

  • To use dense smoke to protect from insects. 

  • To burn herbs as a cleansing ritual (suffumigation). 

noun
  • Dense smoke, such as that used for fumigation. 

  • A quantity of herbs used in suffumigation. 

  • A heap of damp combustibles partially ignited and burning slowly, placed on the windward side of a house, tent, etc. to keep off mosquitoes or other insects. 

  • A blemish or smear, especially a dark or sooty one. 

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