brooder vs incubator

brooder

noun
  • A heated box used for chicks or premature babies 

  • A person who broods 

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 brooder and incubator occurred in a corpus of books? (source: Google Ngram Viewer )