limelight vs unimportance

limelight

verb
  • to illuminate with limelight 

noun
  • A type of stage lighting once used in theatres and music halls, producing a bright light by the use of incandescent quicklime. 

  • Attention, notice, a starring or central role, present fame. 

unimportance

noun
  • Lack of importance. 

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