catbird seat vs citadel

catbird seat

noun
  • An enviable position, often one of great advantage. 

citadel

noun
  • A stronghold or fortified place. 

  • An armoured portion of a warship, housing important equipment. 

  • A Salvation Army meeting place. 

  • A strong fortress that sits high above a city. 

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