readership vs reading

readership

noun
  • The collected readers of a publication. 

  • The role or office of a reader. 

reading

noun
  • The extent of what one has read. 

  • The process of interpreting a symbol, a sign or a measuring device. 

  • A value indicated by a measuring device. 

  • One of several stages a bill passes through before becoming law. 

  • The act or process of imagining sequences of potential moves and responses without actually placing stones. 

  • The process of interpreting written language. 

  • An event at which written material is read aloud. 

  • An interpretation. 

  • The content of a reading list. 

  • A piece of literature or passage of scripture read aloud to an audience. 

  • Something to read; reading material. 

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