highlight vs obscure

highlight

verb
  • To make prominent; emphasize. 

  • To be a highlight of. 

  • To seek the attention of (a user) on IRC by mentioning their name in a message, causing that message to appear highlighted on their screen. 

  • To mark (important passages of text), e.g. with a fluorescent marker pen or in a wordprocessor, as a means of memory retention or for later reference. 

  • To dye (part of the hair) a different color than the rest. 

noun
  • An area or a spot in a drawing, painting, or photograph that is strongly illuminated. 

  • An especially significant or interesting detail or event or period of time. 

  • A strand or spot of hair dyed a different color than the rest. 

obscure

verb
  • To render obscure; to darken; to make dim; to keep in the dark; to hide; to make less visible, intelligible, legible, glorious, beautiful, or illustrious. 

  • To hide, put out of sight etc. 

adj
  • Dark, faint or indistinct. 

  • Difficult to understand. 

  • Not well-known. 

  • Hidden, out of sight or inconspicuous. 

  • Unknown or uncertain; unclear. 

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