ambulatory vs covered walk

ambulatory

noun
  • The round walkway encircling the altar in many cathedrals. 

  • Any part of a building intended for walking in; a corridor. 

adj
  • Of, relating to, or adapted to walking. 

  • Able to walk about and not bedridden. 

  • Performed on or involving an ambulatory patient or an outpatient. 

  • Accustomed to move from place to place; not stationary; movable. 

  • Not yet legally fixed or settled; alterable. 

covered walk

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