cubbyhole vs sanctum

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. 

sanctum

noun
  • A place set apart, as with a sanctum sanctorum; a sacred or private place; a private retreat or workroom. 

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