simmering vs walking

simmering

noun
  • The act of something that simmers. 

walking

adj
  • Incarnate as a human; living. 

  • Able to walk in spite of injury or sickness. 

  • Characterized by or suitable for walking. 

  • Heavily characterized by some given quality. 

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