DO vs imager

DO

noun
  • a direct object 

  • a Doctor of Osteopathic Medicine 

  • dissolved oxygen 

imager

noun
  • One who images or forms likenesses; a sculptor. 

  • A system that creates a digital copy such as a disk image. 

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