birdcage vs henhouse

birdcage

noun
  • A cage to keep pet or zoological specimen birds in. 

  • A game of chance played with dice; chuck-a-luck. 

henhouse

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

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