chicken coop vs henhouse

chicken coop

noun
  • A building, often wooden with wire netting, in which a small number of poultry are kept. 

  • A weigh station. 

henhouse

noun
  • A small house or hutch for chickens or, more specifically, hens to live in. 

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