catalog vs directory

catalog

noun
  • US and Canada spelling of catalogue 

directory

noun
  • A structured listing of the names and characteristics of the files on a storage device. 

  • A list of names, addresses etc, of specific classes of people or organizations, often in alphabetical order or in some classification. 

  • A virtual container in a computer's file system, in which files and other directories may be stored. The files and subdirectories in a directory are usually related. 

adj
  • Containing directions; instructing; directorial. 

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