employment vs working day

employment

noun
  • The work or occupation for which one is used, and often paid 

  • The act of employing 

  • An activity to which one devotes time 

  • The number or percentage of people at work 

  • A use, purpose 

  • The state of being employed 

working day

noun
  • The part of a day in which work is done; the number of hours one must work per day for a specified wage. 

  • Any of those days of a week on which work is done, officially Monday to Friday in many countries (even though many people work on weekends). 

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