bastille vs guard station

bastille

noun

  • A prison or jail. 

  • Confusion of bastille with bastion (bulwark). 

verb

  • To confine as though in a bastille; to imprison. 

guard station

noun

  • Synonym of guardhouse. 

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