blur vs opaque

blur

noun
  • Something that appears hazy or indistinct 

  • A smear, smudge or blot 

adj
  • In a state of doubt or confusion. 

verb
  • 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. 

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

opaque

noun
  • Something which is opaque rather than translucent. 

verb
  • To make, render (more) opaque. 

adj
  • Neither reflecting nor emitting light. 

  • Allowing little light to pass through, not translucent or transparent. 

  • Obtuse, stupid. 

  • Describes a type for which higher-level callers have no knowledge of data values or their representations; all operations are carried out by the type's defined abstract operators. 

  • Unclear, unintelligible, hard to get or explain the meaning of. 

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