Army vs Iris

Army

name
  • Hexagram 7 of the I Ching (䷆) 

  • A sports team representing the US Military Academy at West Point. 

Iris

name
  • A messenger of the gods, and goddess of rainbows. 

  • A female given name from Ancient Greek; a flower name used since the end of the 19th century. 

  • 7 Iris, a main belt asteroid. 

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