ambulant vs ranging

ambulant

adj
  • Able to walk. 

  • Designed for use by somebody with a disability that impairs, but does not prevent, walking. 

noun
  • A patient who is able to walk. 

ranging

noun
  • A back-and-forth movement. 

  • The act of one who ranges. 

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