relentless vs stopping

relentless

adj
  • Unrelenting or unyielding in severity. 

  • Unremitting, steady and persistent. 

stopping

noun
  • The act of something that stops; a halt. 

  • Material for filling a cavity. 

  • A partition or door to direct or prevent a current of air. 

  • A pad or poultice of dung or other material applied to a horse's hoof to keep it moist. 

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