bedroom vs dressing room

bedroom

noun
  • A room in a house where a bed is kept for sleeping. 

dressing room

noun
  • A small room adjoining a domestic bedroom where people may dress or undress in privacy. 

  • A room in a theatre or other performance venue in which performers may change costumes and apply makeup. 

  • A room used for dressing or changing clothes. 

  • A changing room at a recreational or sports venue. 

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