A to Z vs companion

A to Z

noun
  • All facts related to a subject 

  • Any of a set of street maps of most British towns and cities; properly the Geographer's A–Z Street Atlas. 

  • An encyclopedic or comprehensive guide. 

adv
  • From beginning to the end. 

  • Over the entirety; completely. 

  • Alphabetical order; lexical order. 

companion

noun
  • An appended source of media or information, designed to be used in conjunction with and to enhance the main material. 

  • A knot in whose neighborhood another, specified knot meets every meridian disk. 

  • A friend, acquaintance, or partner; someone with whom one spends time or accompanies 

  • A celestial object that is associated with another. 

  • A knight of the lowest rank in certain orders. 

  • The covering of a hatchway on an upper deck which leads to the companionway; the stairs themselves. 

  • The framework on the quarterdeck of a sailing ship through which daylight entered the cabins below. 

  • A thing or phenomenon that is closely associated with another thing, phenomenon, or person. 

How often have the words A to Z and companion occurred in a corpus of books? (source: Google Ngram Viewer )