blur vs hot spot

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. 

hot spot

noun
  • Synonym of heiligenschein (“an optical phenomenon which creates a bright spot around the shadow of the viewer's head, when the surface on which the shadow falls has special optical characteristics”) 

  • A lively and entertaining place, such as a nightclub. 

  • A location in which Wi-Fi Internet access is available. 

  • A dangerous place of violent political unrest. 

  • The region of a gene in which there is a higher than normal rate of mutation. 

  • The surface manifestation of a plume of molten material that rises from deep in a celestial body's mantle. 

  • An area of high radioactive contamination. 

  • A location which has a higher temperature or amount of radiation than surrounding areas. 

  • A part of an application that consumes a significant amount of execution time. 

  • A part of a control (“an interactive interface element”) that responds dynamically as a user moves a pointer over it (for example, a part of an image map that contains a hyperlink which can be clicked on with a cursor). 

  • A place notable for a high level of activity or danger. 

  • An infected lesion in dogs or other furry mammals caused by excessive itching 

  • A part of a forest fire which is burning actively. 

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