hatchery vs incubator

hatchery

noun
  • A facility where eggs are hatched under artificial conditions, especially those of fish or poultry. 

incubator

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

  • 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. 

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