cubbyhole vs incubator

cubbyhole

noun
  • A glove compartment 

  • A small compartment; a pigeonhole 

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

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

incubator

noun
  • An apparatus used to maintain environmental conditions suitable for a newborn baby. 

  • Any apparatus used to maintain environmental conditions suitable for a reaction. 

  • A place to maintain the culturing of bacteria at a steady temperature. 

  • A support programme for the development of entrepreneurial companies. 

  • An apparatus used to maintain environmental conditions suitable for the hatching of eggs. 

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