ambulant vs shifting

ambulant

noun
  • A patient who is able to walk. 

adj
  • Able to walk. 

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

shifting

noun
  • The phenomenon by which two or more constituents appearing on the same side of their common head exchange positions to obtain non-canonical order. 

  • A shift or change; a shifting movement. 

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