coop vs military prison

coop

noun
  • A narrow place of confinement, a cage; a jail, a prison. 

  • A wickerwork basket (kipe) or other enclosure for catching fish. 

  • A cart with sides and ends made from boards, enabling it to carry manure, etc. 

  • A cart which opens at the back to release its load; a tumbril. 

  • A basket, pen or enclosure for birds or small animals. 

  • A small heap. 

verb
  • To keep in a coop. 

  • To shut up or confine in a narrow space; to cramp. 

  • Of a police officer: to sleep or relax while on duty. 

  • To unlawfully confine one or more voters to prevent them from casting their ballots in an election. 

military prison

noun
  • A prison operated by the military. 

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