Empress vs Ensign

Empress

name
  • A village in Alberta, Canada. 

Ensign

name
  • A hamlet in Alberta, Canada 

  • A surname. 

  • A city in Kansas 

  • The official magazine of The Church of Jesus Christ of Latter-day Saints 

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