cubbyhole vs playroom

cubbyhole

noun
  • A small, snug room which may be used as a place of privacy and safety by children 

  • A glove compartment 

  • A small compartment; a pigeonhole 

verb
  • To restrict, limit or narrowly define; to pigeonhole. 

playroom

noun
  • A room, allocated as a children's play area, in which noisy or boisterous activities are tolerated. 

  • A room dedicated to sadomasochistic sexual activity. 

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