backstage vs unnoticed

backstage

adv
  • Towards the area behind the stage. 

  • Out of view of the public. 

noun
  • The area behind a stage out of view of the audience where performers wait to give their show; especially that of the dressing rooms. 

  • The private portion of the space used by a business or enterprise. 

adj
  • Secret, concealed from the public. 

  • Relating to, or situated in the area behind a stage. 

unnoticed

adj
  • Not noticed. 

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